Malicious PDF — malware analysis report

Static analysis result for SHA-256 832151e8c13b4442…

MALICIOUS

PDF

74.9 KB Created: 2021-02-17 16:22:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b2d0a00b0d7775e20ea44f079e706b3d SHA-1: fe998acd76e9d88e5e617703d4fa6d45e9613025 SHA-256: 832151e8c13b44420e6c825d032c84f0bc161989ef23fbf82a303963ad3225c2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it exhibits characteristics of a PDF link farm. It contains numerous external URIs, with a significant number pointing to disposable hosting services, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific purpose beyond the link farm behavior.

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://druttle.ru/wb?keyword=sub%20zero%20fridge%20height PDF link annotation
    • https://gefivogixofix.weebly.com/uploads/1/3/0/9/130969648/bukopazedatinerax.pdfIn PDF document text
    • https://rawiranuxox.weebly.com/uploads/1/3/4/6/134618620/gumakaxorokukez.pdfIn PDF document text
    • https://cdn.sqhk.co/takoxuwal/icrjjjb/tatetavug.pdfIn PDF document text
    • https://fuvetowonilup.weebly.com/uploads/1/3/1/3/131383456/bosulosepawewupume.pdfIn PDF document text
    • http://lishop.site/java_aes_bouncy_castle_tutoriali1akz.pdfIn PDF document text
    • http://republvinb.fun/mysql_last_insert_id_node_jsrvzdr.pdfIn PDF document text
    • https://tovimovu.weebly.com/uploads/1/3/0/9/130969206/3319801.pdfIn PDF document text
    • https://dewokipapofoz.weebly.com/uploads/1/3/2/7/132741709/zozenilobaz-vozazixamavi.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/fgPid4m/raspberry_jam_recipes_with_alcohol.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/80062951785e6ee.pdfIn PDF document text
    • https://sekokuvujiziv.weebly.com/uploads/1/3/4/0/134096710/b4d0bd47.pdfIn PDF document text
    • https://vabinori.weebly.com/uploads/1/3/4/3/134348027/7b898fb2066.pdfIn PDF document text
    • http://devovonabukuzim.66ghz.com/kutty_movies._com_2019_movies.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/icoV4id/zombie_fighting_games_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 5040 bytes
SHA-256: a0c073b53955db76046d7fea0942593b53d02b6cbf155fbc360aae8ccbbf22ae
font_01_sfnt_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 10580 bytes
SHA-256: 8dff9890bc4cb36ad431408795d22e8c56d5548fc41130af39221b11432bc632

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