Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd10c3f249b9f74c…

MALICIOUS

PDF

77.4 KB Created: 2021-04-29 04:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4f3aa8bfd55bdd22b70642878c0c2702 SHA-1: 2f0edb188d31cbe35ee23148f8619c2555782786 SHA-256: bd10c3f249b9f74c6f4d4a8ffafc47ffb506b53ebc2c92b1de8ebb51743d1d27
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The primary malicious URL identified is https://dafemum.ru/strik?utm_term=good+compare+and+contrast+essay+topics+for+college. The document body, though obfuscated, appears to be a lure related to essay topics, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://dafemum.ru/strik?utm_term=good+compare+and+contrast+essay+topics+for+college In PDF document text
    • https://moforikegumiret.weebly.com/uploads/1/3/2/6/132680993/3866049.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477886/normal_5ff4eaa56c3d2.pdfIn PDF document text
    • https://vibofizetukoz.weebly.com/uploads/1/3/0/9/130969748/ccb52b46f5cf6.pdfIn PDF document text
    • https://rujogapojepon.weebly.com/uploads/1/3/4/5/134597846/xizodozagaxut.pdfIn PDF document text
    • https://zoguripan.weebly.com/uploads/1/3/1/0/131070442/9880434.pdfIn PDF document text
    • https://golurivuj.weebly.com/uploads/1/3/4/7/134744385/6995739.pdfIn PDF document text
    • https://xanavixigusom.weebly.com/uploads/1/3/1/4/131453194/pagexoke_zibipetifutenon_zujovi.pdfIn PDF document text
    • https://nasaxedinevizuv.weebly.com/uploads/1/3/4/7/134759800/7020536.pdfIn PDF document text
    • https://kazajiti.weebly.com/uploads/1/3/4/4/134456981/cafbcc596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_6042e6ae16410.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_13ffc3c71c8e4e559f9dfab4d9156981.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/70e606a9-2720-4b04-9a91-ff8e7892564b/ginamopeki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d61344e9-fa46-486d-8573-683960390cc1/pefomujopufotim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3cbddf1-f87e-460e-9c01-3d4aeb383898/how_to_troubleshoot_a_refrigerator_that_is_not_cooling.pdfIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_61f29f42a5094345bb2454396b9e0d96.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/112c3198-b083-432b-ba46-0d3034a2c790/83278899735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f55e0520-43fb-418d-8010-c2ea5ef72a67/47307275020.pdfIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_b38ca7d84c1f4c90b690818b9842f066.pdf?index=trueIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_3fc1efdb75e64507b44f1f0d74950713.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e852c728-7186-48be-9979-3841d888e356/what_is_the_theme_of_after_twenty_years.pdfIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_7b3b09ca002943d7a82504ccde6f5c31.pdf?index=trueIn 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_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 5608 bytes
SHA-256: 1993121449e6bac7c15013e52b7a3b6fb4e47b621a83fb9c54ac0dfc6b92e69c
font_01_sfnt_off000104a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 10472 bytes
SHA-256: 3956e32a5478c631621ffb646144da3b314d138b2c3418c8018e3a56b72227a5

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