Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7157dac138338e4…

MALICIOUS

PDF

81.1 KB Created: 2021-02-23 19:15:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9326691ade09a6560704114fa26ef240 SHA-1: 7b7f165b1a5b8318f6bb7b8b818b89be81bf8abf SHA-256: f7157dac138338e4f3a4c8e0de201da808b53f7626bf30e921ace2951f62b3f3
126 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://baarspo.ru/123?utm_term=petsafe+collar+reviews PDF link annotation
    • http://xovoposinakok.22web.org/multiplying_fractions_examples_with_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387031/normal_5fe0bb07e1cd1.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwojeta/LEkq7id/vegabewexovake.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/hafPijj/portals_tactical_2d_shooter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467278/normal_601664e192ef9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464707/normal_5ffa257f3fa68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393499/normal_6020942913f3c.pdfIn PDF document text
    • https://cdn.sqhk.co/lalivaga/Tji3Cc1/gagirozenane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499651/normal_5fd2a8b783e41.pdfIn PDF document text
    • http://coloradocustomelectric.com/fill_in_d_d_5e_character_sheet8dm1z.pdfIn PDF document text
    • https://cdn.sqhk.co/zazifutunoj/iifSWaT/99426357254.pdfIn PDF document text
    • http://beruvutekimeged.22web.org/39417839860.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kikuzekoxo.rf.gd/hp_envy_dv7_review.pdfIn PDF document text
    • http://kosinatatit.rf.gd/ielts_academic_writing_task_1_sample_questions_and_answers.pdfIn PDF document text
    • http://jonufinufezo.epizy.com/login_page_template_in_angular_6.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_off0000fe09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE09 5028 bytes
SHA-256: 7f841e135882bbaa2e6222b92294adf953255d034f11bdcbd00fec7d4dbab3f0
font_01_sfnt_off00010f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4B 11888 bytes
SHA-256: 04552f3fc7f73af012a70877643de7341092fc0d725015f659e2337fae399a6f