Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc3170f8fb55834…

MALICIOUS

PDF

74.5 KB Created: 2021-06-10 22:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c507e4a94a1a4ffba36a029d3d1e3644 SHA-1: 7d6d434968dd87bd0feef5031c41f70674758e0c SHA-256: 4fc3170f8fb55834f7e37583275f94e030e85426918b29408eed708beb732eaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, indicative of a link farm or phishing attempt. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/123?utm_term=house+cartoon+background
    • https://static.s123-cdn-static.com/uploads/4409827/normal_5ff7cc4c59a8b.pdf
    • https://static.s123-cdn-static.com/uploads/4368740/normal_60031cf270b43.pdf
    • https://cdn-cms.f-static.net/uploads/4462350/normal_6027f878e0d78.pdf
    • https://tepugajir.weebly.com/uploads/1/3/0/8/130874129/xabixodaxot.pdf
    • https://cdn-cms.f-static.net/uploads/4453907/normal_60600015a4ea1.pdf
    • https://lovokavupas.weebly.com/uploads/1/3/0/7/130776776/02d830e24c.pdf
    • https://cdn-cms.f-static.net/uploads/4417675/normal_602b32e823a31.pdf
    • https://cdn-cms.f-static.net/uploads/4421061/normal_5fd149ee1070b.pdf
    • https://cdn-cms.f-static.net/uploads/4463528/normal_6023379e96f7d.pdf
    • https://static.s123-cdn-static.com/uploads/4453332/normal_5ff682cda5732.pdf
    • https://cdn-cms.f-static.net/uploads/4377938/normal_605c13523154f.pdf
    • https://cdn-cms.f-static.net/uploads/4497685/normal_6064176e46b44.pdf
    • https://static.s123-cdn-static.com/uploads/4484995/normal_5ff24fe169a90.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tanoroxamo.pbworks.com/f/dabidudofizagamogexakebo.pdf
    • http://doxawadar.pbworks.com/f/moon_horoscope_meaning.pdf
    • http://pagorevet.pbworks.com/w/file/fetch/144444645/physical_science_grade_12_module_1_answer_key.pdf
    • http://zatesil.pbworks.com/f/jadurewepi.pdf
    • http://finatin.pbworks.com/f/79567801779.pdf
    • http://jedilukiwo.pbworks.com/f/what_does_a_fake_pregnancy_test_look_like.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7e4.bin
2cbb09686df7fb1b4209a1aca6638e2abd3d7ca2652c5f65d1ce583de3237e90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 5240 bytes
font_01_sfnt_off0000f9bf.bin
9b3ea4be0e78ecbd856133d020b69e0894facc1a0ffab6f64834ee9547aaf9da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 10380 bytes

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