Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb3033337a17e98…

MALICIOUS

PDF

81.4 KB Created: 2021-02-25 19:14:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ce88d9aa1b15964217c7028b74745374 SHA-1: 5c037e754673ccc1c695376ff1a1150089340549 SHA-256: acb3033337a17e9845ae77af6fd9d224e452e95101ab1bfe992000857ac717fd
156 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 5

  • 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.
  • 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://druttle.ru/123?utm_term=lg+g+vista+2+specs PDF link annotation
    • https://zugimawaxudal.weebly.com/uploads/1/3/1/4/131410952/4152104.pdfIn PDF document text
    • https://cdn.sqhk.co/sepufaziru/gejehem/nobigage.pdfIn PDF document text
    • http://moderivapotilos.22web.org/kisuzizilopi.pdfIn PDF document text
    • https://gifaxopolipo.weebly.com/uploads/1/3/0/7/130739444/95046.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/gAUwigN/rufifumevodasiv.pdfIn PDF document text
    • https://vedewoxid.weebly.com/uploads/1/3/0/7/130738666/nokog-fokozoxof-rarixubi-werebemetesa.pdfIn PDF document text
    • https://renokogepebamon.weebly.com/uploads/1/3/2/6/132696434/lafidelotodagad.pdfIn PDF document text
    • https://xezatitewifesel.weebly.com/uploads/1/3/4/3/134393938/jijiwevizoj.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/dWibCiS/ludujofoporidepoxaximes.pdfIn PDF document text
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/8fd14899c4cb9.pdfIn PDF document text
    • https://wudizabilizone.weebly.com/uploads/1/3/4/7/134745746/2234265.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/levovod/wahbah_al_zuhaili_usul_al_fiqh_al_islami.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/hiatus_hernia_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/seroma_formation_after_hysterectomy.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/sophisticated_investor_certificate_template_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/ixl_english_worksheets_for_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/7584611207.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/assetto_corsa_f1_1998_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/kamejulabigokoxofutaw.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_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 5104 bytes
SHA-256: 5f0ba068d915fb1b8ac5afe58204afd086c2d543fce0343cefbdc74b77e109a0
font_01_sfnt_off000113e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E6 10788 bytes
SHA-256: 41dc8f27f947552ac63543def8da684502254d765bc711309fa51b6a09c962e2

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