Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5d6c2d80a5c43b…

MALICIOUS

PDF

92.0 KB Created: 2021-03-19 10:17:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: df78272f79e287909c9fdd003df6b90e SHA-1: 348dc00104eb9d50455cfc7ef162b1edf0cad208 SHA-256: 8d5d6c2d80a5c43be15bee6166b52c1235343a8be6099f9df1e7d446ba1e621e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spam campaign. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/wix?keyword=building+java+programs+pdf+download PDF link annotation
    • http://kubodir.22web.org/47341125651.pdfIn PDF document text
    • https://cdn.sqhk.co/bidamasegom/NgejfuH/star_wars_galaxy_of_heroes_game_center.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/kig40SN/zimirigudowose.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/goodreads_reviews_2020v3pqf.pdfIn PDF document text
    • https://xugofijale.weebly.com/uploads/1/3/4/3/134314188/123d19fd.pdfIn PDF document text
    • https://nipixajivoru.weebly.com/uploads/1/3/1/4/131436983/44c88a52a.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/XYBiahc/riboxixetivupububux.pdfIn PDF document text
    • http://subfamjtii.site/22960793369lwiew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zusewijoje.epizy.com/13318597817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e92a94ac-abd8-425f-a80f-e5b1bbcf5860/nolidovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efac8510-ba94-4d05-b034-d63201c1bb0a/how_to_set_up_an_appointment_at_the_dmv_online_florida.pdfIn PDF document text
    • http://wenavigabex.rf.gd/38968637806.pdfIn PDF document text
    • http://lajirobodogew.epizy.com/86027727579.pdfIn PDF document text
    • http://noxebujo.epizy.com/zaxifidujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c807d02d-c09f-4a7f-9f6b-4966d53a5ce5/zegazinezakimoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/904df1ef-a781-421c-b765-59c81e0b05bd/electronic_battleship_advanced_mission_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d57a561-1cd1-48ee-9dbe-a0bf59a9d6a7/neretugatetekajutuxopife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07bfe65a-2336-473d-a084-7f9edfe69c5b/xekatomexumux.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12571 5640 bytes
SHA-256: bfe397a7d50f379921b10540ee25dd6183f5f1fcd491cf0bd4d8dbc242685636
font_01_sfnt_off000138a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A8 12940 bytes
SHA-256: b9dfec8504948655df495f1f8157c2f46f9d3e0a0f5db6242088ee144ac523c2

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