Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74afef0c81bebb3…

MALICIOUS

PDF

70.1 KB Created: 2021-02-13 08:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: eaed2ef417dc46d147294c3de2ca02a6 SHA-1: 5aebad1d040a198f682bef2c516a52055b647a2c SHA-256: a74afef0c81bebb37f37ab3ee8044cb85c882b194c31d49b05478c2a8589472f
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://bologen.ru/123?utm_term=one+point+perspective PDF link annotation
    • http://cloudmarket.website/69934799792b9rbs.pdfIn PDF document text
    • http://henrysavbr.site/118492988702wi6d.pdfIn PDF document text
    • http://bluhgang.best/12_hsc_biology_textbook_downloadjq2ed.pdfIn PDF document text
    • http://xusibuvuzos.22web.org/utorrent_pro_free_full_version.pdfIn PDF document text
    • http://trujillostacoshop.com/nepedepamurijemarikijxq2kx.pdfIn PDF document text
    • http://mybestchan.online/40712016458bltxc.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/IMQcDic/papumupeziremegaxegap.pdfIn PDF document text
    • https://cdn.sqhk.co/fitamorigob/gcAgcYH/94082104761.pdfIn PDF document text
    • https://cdn.sqhk.co/matajikiwov/hblwSig/capstar_flea_treatment_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/vixonafom/UHuXAHq/43151035612.pdfIn PDF document text
    • http://bas-vorota.ru/43730567977ok10d.pdfIn PDF document text
    • http://zuzitijimopa.22web.org/spring_boot_thymeleaf_form_post.pdfIn PDF document text
    • http://vvinorama.fun/omg_facts_you_must_know_amazing_factsks5gf.pdfIn PDF document text
    • http://noxopadorilu.iblogger.org/seditedukogekululipe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiwuvapinemugi.rf.gd/72850243127.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/75594098575.pdfIn PDF document text
    • http://kixomeremit.epizy.com/galletas_de_arroz_informacion_nutricional.pdfIn PDF document text
    • http://kapetevik.epizy.com/53228878688.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/14314278137.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_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 4772 bytes
SHA-256: 3a9e7450f101ff350cfb06e9fa8c0d2d047a0739c65fe9382590cbc55b455591
font_01_sfnt_off0000e81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81B 10480 bytes
SHA-256: 7b08d955e418343ff6ca9aea2559af95cc0a45fa779257039537e0203ccf0921

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