Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0cc969e571a3f5b…

MALICIOUS

PDF

76.4 KB Created: 2021-04-02 13:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 782a7014048faefa24a009b17025f25e SHA-1: ce2e21266c20b997efed6a202e0e9989f6ee6256 SHA-256: f0cc969e571a3f5bb21c2387d121bdf3d0b8166146a6088646a6b8e7a701a36b
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://crophysi.ru/strik?utm_term=audacity+full+version+free+download+for+windows+8.1 PDF link annotation
    • https://biwawidojimu.weebly.com/uploads/1/3/4/6/134648839/7840189.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://sayfelengs.space/fizegalosigiwuzotevozisl86bz.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://kojozoxilasa.weebly.com/uploads/1/3/5/3/135302893/f35d0886.pdfIn PDF document text
    • http://boviriso.22web.org/tesla_model_3_price_lowered.pdfIn PDF document text
    • https://vesanalu.weebly.com/uploads/1/3/1/4/131482823/683044.pdfIn PDF document text
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/widogegekelukem.pdfIn PDF document text
    • http://mkr-olimp.info/goal._com_live_scores_premier_league_tableq6f0w.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://gelaleted.rf.gd/shed_construction_plans.pdfIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_7dbe71735c5c4c4bb6a0ead6393160c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gewisetug/59254111814.pdfIn PDF document text
    • https://2b01876c-5741-4e94-bfb6-30973e4a6517.filesusr.com/ugd/45d688_813ef5e605b04b12939bc28a19408d19.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/18376972262.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/61568861452.pdfIn PDF document text
    • http://vineberute.epizy.com/pakidixobedirowusare.pdfIn PDF document text
    • http://lemujiv.epizy.com/background_png_hd_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01C 5420 bytes
SHA-256: 1a53c6c14d4e31b186ca33e067ed29d4f90739444bbb37c3defc9ef27a5252b4
font_01_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 10344 bytes
SHA-256: 61fa3923f0605372c73507cf93df142d3e03f8347f6e01022a9a4e0c60e993ac
font_02_sfnt_off00011615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11615 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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