Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8ce87efa50caba…

MALICIOUS

PDF

77.8 KB Created: 2021-04-07 23:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 46cdf6dc324fb226ca8b5e8ea46abfda SHA-1: 589e55385b687fb3aa4fab0ce38a45e38dea4be2 SHA-256: ff8ce87efa50cabae4e5054fc32c641f48588cb8b8402d32073641dca756a7da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://zajinet.ru/wix?keyword=theology+study+guide+quizlet PDF link annotation
    • http://inglassrus.ru/ruwaragufis7wwx.pdfIn PDF document text
    • https://cdn.sqhk.co/sagitusat/PSEhggi/togikipo.pdfIn PDF document text
    • http://medugogubi.22web.org/apartment_address_format_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/sepolulegaba/bjdiezQ/2246417688.pdfIn PDF document text
    • http://usecabinets.xyz/bulufihyu6.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://naturebiolog.fun/how_to_turn_off_kidde_nighthawk_carbon_monoxide_alarma7192.pdfIn PDF document text
    • https://cdn.sqhk.co/rirexiwudag/hjig7hd/red_alert_we_make_events_cincinnati.pdfIn PDF document text
    • https://vaseviga.weebly.com/uploads/1/3/3/9/133986607/9ed74df9a0.pdfIn PDF document text
    • https://cdn.sqhk.co/sezabaxo/ictUygi/words_that_start_with_s_meaning_fun.pdfIn PDF document text
    • https://xokefinodoju.weebly.com/uploads/1/3/5/3/135316617/600f35e9e20.pdfIn PDF document text
    • http://narelavupes.22web.org/96834533663.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mexejuxoxaf.epizy.com/how_to_make_a_story_step_by_step.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/porsche_owners_club_autocross.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/arkanoid_game_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/yamaha_ef1000_generator_carburetor.pdfIn PDF document text
    • http://tinejamuwaki.epizy.com/masesemuriramepuxoginefu.pdfIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_6e8392ce260f4b8e83845ff8b3ac102a.pdf?index=trueIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_6d6014ad0dc147b1ad00ae6893e944e4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 5008 bytes
SHA-256: 961e68f1b46e46a54b431ba0c6ddd1d325ec0de718bf26e0d9df24901e6ab7e6
font_01_sfnt_off0001035b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035B 10880 bytes
SHA-256: 45dc34410b9719629082ada49ed9b2a926de8e57114a58eb124fc0ae85977391

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