Malicious PDF — malware analysis report

Static analysis result for SHA-256 36081cd75abad6e6…

MALICIOUS

PDF

82.6 KB Created: 2021-04-08 04:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18c70ee8abe4db77bf619ba33188a812 SHA-1: 9e2fdc12dab1aed7afd1a66715fb7ec54c6891bb SHA-256: 36081cd75abad6e6a59d9e78364132329f6fdf4a228729bd1aae5fc07f04ba53
206 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of a callback lure heuristic indicates a potential phishing or scam attempt. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://xezojetit.ru/123?utm_term=harassment+magistrates+sentencing+guidelines
    • https://static.s123-cdn-static.com/uploads/4486987/normal_60079d0c35be2.pdf
    • http://walabowagem.iblogger.org/92112143303.pdf
    • https://static.s123-cdn-static.com/uploads/4448719/normal_5fcc018e639f2.pdf
    • http://fanilepitas.22web.org/31621915484.pdf
    • https://static.s123-cdn-static.com/uploads/4374198/normal_5feb447ee9fdb.pdf
    • https://cdn-cms.f-static.net/uploads/4445130/normal_6010c77f7c6e9.pdf
    • https://static.s123-cdn-static.com/uploads/4426547/normal_5feec3bf34b8c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_c361fa2a4b4b47759c8bfc745654a51d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/05103d30-5783-4e95-9386-c22301b83e56/tamigotapogaxasufila.pdf
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_b7ac7f762f3343f4a6b0daf1e30931b5.pdf?index=true
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_c51dec925fda4c0e82fe3f2e43ab2070.pdf?index=true
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_3816455eceb6487fadcfaef347fd4cfb.pdf?index=true
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_d4600ca916944cef8da585ab4a0c0069.pdf?index=true
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_3e5a7da8f76c45bbbc9f12abe9e3a719.pdf?index=true
    • http://xuvunemomot.epizy.com/70240629475.pdf
    • http://purumurik.epizy.com/55068056040.pdf
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_a0afdb7d24eb470090ebbff03d29c73a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4611f0c6-161f-477c-97ef-5956626a66df/49489082783.pdf
    • https://uploads.strikinglycdn.com/files/e82a7939-bf5b-463c-aa52-382828f33130/sct_livewire_ts_mount.pdf
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_403cb366f2a2485ba821afca287d8bcc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ee0ad712-066a-4729-a0bb-6784af372520/50374758172.pdf
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_3041c1e12f5b4c1a850d0f5105424ebe.pdf?index=true
    • http://xatofuli.rf.gd/badumetezoko.pdf
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_6600ba1c092f46aaaeb183c0fc70361f.pdf?index=true
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_583e11ff631e4eeeb9b0ce5c71cf2895.pdf?index=true
    • 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_off00010411.bin
add6414b176ca6531cdbc0e378c211c645fee737ad79ea1c3d59e2780754af6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10411 5220 bytes
font_01_sfnt_off000115b7.bin
33652fa21f573090723bde805440764f72ba4d5ea36a40ee6043c00370a36a17
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 10812 bytes