Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f76dc55337f0ef9…

MALICIOUS

PDF

80.4 KB Created: 2021-04-09 05:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a68bb08181e9d45795968015ea4fb885 SHA-1: 184aa3547880212c7ba0a04c7ec0d7e9016b8ea0 SHA-256: 1f76dc55337f0ef95fa2c5851f9bad23086b2cd4dc0edc23b52baf3273b31ede
134 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. It uses an urgency-based lure. 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://zajinet.ru/strik?utm_term=brother+printer+hl2240d+driver+download PDF link annotation
    • http://nijalatol.mypressonline.com/52175628387.pdfIn PDF document text
    • http://werikipirojenob.scienceontheweb.net/bmw_s1000rr_2020_manual.pdfIn PDF document text
    • http://ihsteam.ru/frick_industrial_refrigeration_-_waynesboro_pa0nszm.pdfIn PDF document text
    • http://xagugudel.sportsontheweb.net/what_does_the_death_of_the_author_mean.pdfIn PDF document text
    • http://werikipirojenob.scienceontheweb.net/92503053860.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/j5N1T4n/planescape_torment_walkthrough_gamebanshee.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/rolegotolosewimudegu.pdfIn PDF document text
    • http://fodekofuxuvum.sportsontheweb.net/accuracy_and_precision_in_physics.pdfIn PDF document text
    • http://flowerport.store/muwudulo0ul3.pdfIn PDF document text
    • https://cdn.sqhk.co/zotenejek/Vid0Zif/majara.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pofijiserige.onlinewebshop.net/17913007996.pdfIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_f5b848dc813e41cc9581e80a7f721fc9.pdf?index=trueIn PDF document text
    • http://bupalim.atwebpages.com/61450728944.pdfIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_c88bcc7de7d94fc9be6fe042e88f2bd0.pdf?index=trueIn PDF document text
    • http://zukomakiduw.myartsonline.com/31006476068.pdfIn PDF document text
    • http://todidetiped.onlinewebshop.net/fojivugu.pdfIn PDF document text
    • https://1a899ca6-11bf-4464-971e-4bf0b885e765.filesusr.com/ugd/4ac3ff_41f4283226264d74a4993e324b3db8df.pdf?index=trueIn PDF document text
    • http://vawerudarasikow.myartsonline.com/cerfa_rupture_conventionnelle_2020_remplissable.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_off0000fbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 5432 bytes
SHA-256: 9bec2aa7e45eb38b279fba5c6c7b44728cdfea57d32b9abef184978aa915b98e
font_01_sfnt_off00010e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E48 11200 bytes
SHA-256: 212d3e3f55e652926dff1a04be1e3f72071935455a7fdfa087f2d99e9d3a84f0

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