Malicious PDF — malware analysis report

Static analysis result for SHA-256 9148122fde26a47d…

MALICIOUS

PDF

65.0 KB Created: 2021-03-31 23:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6f93ba6bcee595cbb236f462ed8a8dc7 SHA-1: 8885da033becc37ae6c5fe67f016c38b978a515d SHA-256: 9148122fde26a47dccdcec5e9b60a6469c8a7ddac2e417c39d480369588aea75
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://fokemale.ru/wix?keyword=stoichiometry+worksheet+ii+answers PDF link annotation
    • https://cdn.sqhk.co/purijiralug/jKhejiv/various_biotransformation_reactions.pdfIn PDF document text
    • https://cdn.sqhk.co/segevenujuka/bhcifie/78789647342.pdfIn PDF document text
    • https://cdn.sqhk.co/jijasitov/djaHMg8/646101634.pdfIn PDF document text
    • http://soluzixod.66ghz.com/lefofutesapufelufak.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/fhb9hgR/82408487455.pdfIn PDF document text
    • https://cdn.sqhk.co/popaxutu/Azpgg0P/85427265543.pdfIn PDF document text
    • https://cdn.sqhk.co/milevatomog/AihWIgf/tomabidimuvokepurubig.pdfIn PDF document text
    • http://debuged.mywebcommunity.org/basic_actuarial_mathematics.pdfIn PDF document text
    • https://cdn.sqhk.co/lujobitazeku/Ngc8jiE/5320145677.pdfIn PDF document text
    • http://wowuwifun.iblogger.org/calentador_solar_de_agua_con_botellas_pet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_da75c1c875a446a7a8d60e507fe91a20.pdf?index=trueIn PDF document text
    • http://kafotafuvodalix.onlinewebshop.net/toro_ccr_2000_model_38180_parts.pdfIn PDF document text
    • http://vesofimuni.rf.gd/ableton_live_10_shortcuts.pdfIn PDF document text
    • http://nanefelizili.epizy.com/what_does_a_singer_walking_foot_look_like.pdfIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_eb8d6637f3ba4dc0b52d7a9d013e4070.pdf?index=trueIn PDF document text
    • http://xonelamurojili.rf.gd/gobet.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_off0000c21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21D 5368 bytes
SHA-256: 2350dd0cf38d50f57dfe7bfeaae3e2f5dc829a696920a5a965de319b3e9654c8
font_01_sfnt_off0000d449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD449 10272 bytes
SHA-256: b49db63d02a305818dd082585e9491ae743771d8899b65a585e0c4f9b6d564f7

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