Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f6410f110913e6…

MALICIOUS

PDF

79.7 KB Created: 2021-04-03 14:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b4943d9409145b2be1b11c75c5d0ca06 SHA-1: 1ed2a1fa0f12ef3d06588783b0dd26e130e66981 SHA-256: a6f6410f110913e6bbc19f9997185fd70952f5518674f824c4917fc8f9aaf7ce
184 Risk Score

Malware Insights

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

This PDF file contains embedded links that redirect to a malicious URL, likely intended to trick users into downloading malware or engaging in phishing. The heuristic firings indicate the PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=apk+super+mario+bros+3+para+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_6020bd3ed7bb2.pdfIn PDF document text
    • https://cdn.sqhk.co/zegareguw/V5ib5nh/18196744519.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453334/normal_5fc7a7ff4aed0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_600da10607fde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393624/normal_6001cf7ac489c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_60493b144c521.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/ihhhjhu/men_s_olympic_archery_distance.pdfIn PDF document text
    • https://cdn.sqhk.co/mudemodox/Kjf97jY/the_great_tournament_2_apk_full.pdfIn PDF document text
    • https://cdn.sqhk.co/xanapaje/hgheCje/sudoku_hard.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mewexam.epizy.com/aarambam_theme_song_in_masstamilan.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_24e7789104a84b418e5c131ac9017541.pdf?index=trueIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_06cf0e98c9cc4ae8a579c35af33717a1.pdf?index=trueIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_2580f80555ba4a958cf50a83d80f6ddf.pdf?index=trueIn PDF document text
    • http://potubavaziripek.epizy.com/kikotik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d3b1d4d-9b92-4445-9197-e6d40617a40f/tokad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2baad7f8-cc24-4376-b8b4-2db62c1dc3a7/riwijigoxidewax.pdfIn PDF document text
    • http://loviwep.epizy.com/organic_chemistry_reactions_of_alcohols.pdfIn PDF document text
    • http://likijanima.epizy.com/sample_performance_appraisal_comments_for_teachers.pdfIn 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_off0000ef2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 5428 bytes
SHA-256: c26109ee48046e7f663bccb89afae8988ad8a1b2c46c380b58bb4bea4d2c065c
font_01_sfnt_off0001017a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017A 1924 bytes
SHA-256: a0e67e6cda0e5dbcebfe82fb95abf6330ac7de70c85b3c681b16a54690e4e2a7
font_02_sfnt_off00010ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 11068 bytes
SHA-256: 03c2e053bbf6f4ee62c2a57d970cdd0851fc6faf41c01390ce5b648c26a2a49a

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