Malicious PDF — malware analysis report

Static analysis result for SHA-256 0913f58c190e78d2…

MALICIOUS

PDF

99.4 KB Created: 2021-05-02 17:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0c7e0847607d4230ff2ed1d6e4c747dd SHA-1: 28448090510dcd74fe19376ce333ad287e3c2ed2 SHA-256: 0913f58c190e78d2fdbb1847d5a4ee1d76f783812c0a49148cdeb049f3d29eba
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 0.9993

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 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://ponafet.ru/strik?utm_term=emergency+care+and+transportation+of+the+sick+and+injured+11th+edition+answer+key PDF link annotation
    • http://ipatovaalena.ru/gubizesoki5y8jy.pdfIn PDF document text
    • http://hr-insider.com/hitachi_led_tv_reviews_indiaxnmvf.pdfIn PDF document text
    • http://ital-girl.space/best_vpn_for_pubg_mobile_liteqteo5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_37b4d0f9314c409a9c96fb8e598048fa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/36422257205.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/apheresis_guidelines_2019.pdfIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_1184291521ea4c2c81d8c588e23e6d10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/nepunurosujaviwa.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/fenubekoson.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/west_tech_high_school_cleveland_ohio.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/momidijobajobebeloz.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/wezamu.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/artificial_intelligence_a_modern_approach_3rd_solution.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/how_to_make_a_daycare_business_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/54201351287.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/gqf_1502_sportsman_incubator_review.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/xoranopekipozavumiludog.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/alice_walker_everyday_use_theme.pdfIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_8c2796c72d154b7e9b0d3992fb0622ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/83969574482.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/blumberg_forms_nyc.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/xuxenil.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_off00014474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14474 5880 bytes
SHA-256: 3476d4db0b1630bff8f122ba2c9e6fd2ad7ef24be5e0c5025b2e23e712e99a80
font_01_sfnt_off0001587b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1587B 11700 bytes
SHA-256: 7224037dcee772636645f0974050e65fca8fe3f40229f5d022064932f261d83f

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