Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a11eff234f3fbd…

MALICIOUS

PDF

82.1 KB Created: 2021-03-20 06:53:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c3045e605f6a60dc82af4d75f7688e23 SHA-1: 20f67c133a3e87f056ea5fdd95938f605bbb20d7 SHA-256: 56a11eff234f3fbd42ecd7e2a8ceb07c85b47e845d020cea2b6d7a7f6eee8ad5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, characteristic of a link farm designed to distribute traffic or host malicious content. One of the embedded URLs, https://xezojetit.ru/123?utm_term=atlas+anatomy+human+body+pdf, is flagged as malicious. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a large number of external links, with some hosted on disposable domains, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xezojetit.ru/123?utm_term=atlas+anatomy+human+body+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501233/normal_5ffe216f76f8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368229/normal_5ff40fd1ac02d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_60187d6f72359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417530/normal_6052a7b4ea446.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425501/normal_5ffeb21ab758e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/26bb6ed9-c737-42bb-8d59-419520ea6d49/how_to_make_green_eggs_and_ham_with_food_coloring.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5439890c-2082-4c52-8545-6ab5a99f847d/why_is_the_rising_sun_badge_important.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bd2e9ca-3dd8-4c86-a61e-1cae997eb47d/26517886596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b35280-2f0f-4e39-bfb6-b5d3dcd4aff1/bowumixagogutojofopuxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16384c6d-c88c-4408-9014-c488be68bf81/80776614458.pdfIn PDF document text
    • http://womirejosowasu.epizy.com/pewenenotuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b257cc6-67f3-4289-ac3d-094a1490acbb/jaxibewobilumetizojub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4020519f-eaa6-4620-9b85-e136609c3107/how_old_is_rivera.pdfIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_795b52ca9a45427cb162180a17e47ebd.pdf?index=trueIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_0052d30293b34c6896f4ba4a990cd69a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36ecc789-0834-464b-a7ca-0f97c0467ecb/m2a1_machine_gun_technical_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5bb07cb-e5dc-4444-9962-25b4c73623fb/how_to_grow_and_harvest_dates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0165878-5595-4bf5-9296-e2f3d8be8e65/rilatetotimifefalufeba.pdfIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_7d58a8e0ff184a22b8dfe520ddae7620.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf6fa053-cba2-4b79-8cf6-b45d4878f282/10000_most_common_korean_words.pdfIn PDF document text
    • http://veboluzamusi.epizy.com/68158310793.pdfIn PDF document text
    • http://laraduvusu.epizy.com/bmw_car_hd_wallpaper_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20aae6b-3413-477e-b5ce-36f598f2c7fc/fotevigipemaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ced07308-bea6-4268-bb08-b13bf3440079/35963461896.pdfIn PDF document text
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_d6e2f0adc1c64d9d981b489f6e2b198e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/16b8acf0-6ca4-4383-a350-b2aacdc03b91/83006630638.pdfIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_86572bb2fc7648f4a86e16364403f03d.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 5132 bytes
SHA-256: 480d197636093f00c3de43d2960b2b46ac2549d97bce88e578bc6304b9a23cc6
font_01_sfnt_off0001068b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 11216 bytes
SHA-256: c103ec04371ee9cc7b50536dfe3b6d9821d735581b24748719ac95c26c88c370
font_02_sfnt_off00012c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333