Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0adfa39f893d53…

MALICIOUS

PDF

81.3 KB Created: 2021-02-15 05:09:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a1bf6adc987618ae02c9d9aa66cb9a10 SHA-1: 931100418d9a3105da430361c128bd3b4d434a83 SHA-256: 7b0adfa39f893d539ac9e4fdeda2981413b16a28c559664362f0a5cc05b33dcf
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/wix?keyword=skyrim+stony+creek+cave+bandit+leader PDF link annotation
    • https://javesuput.weebly.com/uploads/1/3/0/8/130873829/3408bb1ae3.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/gthdJJK/mifozazutij.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/jgdZBig/raberatusapaxuve.pdfIn PDF document text
    • http://myfoxing.online/toontown_rewritten_task_guidetv005.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/XjciZjh/panels_comic_reader_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/torixugajo/bCxRic8/luzurewotabi.pdfIn PDF document text
    • https://vezefujofebiv.weebly.com/uploads/1/3/5/3/135304234/woxutupo.pdfIn PDF document text
    • http://bokifov.iblogger.org/79161717473.pdfIn PDF document text
    • http://erogan24.website/84632140353e0t7l.pdfIn PDF document text
    • https://nonexivibofopuv.weebly.com/uploads/1/3/4/6/134603010/3ce2887.pdfIn PDF document text
    • http://merishwheelrecords.com/pulumijukovolo79osg.pdfIn PDF document text
    • http://bilkan.fun/20847937351mbpcf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fubusomarixemuw.rf.gd/24378516081.pdfIn PDF document text
    • http://duposul.epizy.com/dadamswi_nwngw_bodo_song_hd_video.pdfIn PDF document text
    • http://webubop.rf.gd/free_login_register_template_bootstrap.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/episcopal_baptismal_certificate.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 5340 bytes
SHA-256: 5cb514041faccbbfa3099272289865f825e8f1b85f1052743e63d0bd894c6cd0
font_01_sfnt_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 10940 bytes
SHA-256: c0db1a2437dde3c03c393565c26ba1c19c2e85be35d8528e6756c85bd3f15bd9
font_02_sfnt_off0001296e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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