Malicious PDF — malware analysis report

Static analysis result for SHA-256 165cc209b2188c57…

MALICIOUS

PDF

75.2 KB Created: 2021-04-17 18:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 212931ab811926c36bef41cc2387ddb7 SHA-1: 755eac66074ffdd53132d64a929149967002615a SHA-256: 165cc209b2188c57776e9c3b6dcb53a501446bb692105fa4340fcae086b5a1d5
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, including one that appears to be a phishing lure related to gas heater installation costs. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and embedded links suggest it is designed to drive traffic to potentially malicious or scam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://xajibur.ru/strik?utm_term=how+much+does+it+cost+to+install+a+gas+heater PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419003/normal_60661f7647cc8.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/7315955.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/65jjhje/battleline_tactics_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413986/normal_5fd629c664ea0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_60686d787da90.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/d20pbhj/66493679622.pdfIn PDF document text
    • https://muwivagejexe.weebly.com/uploads/1/3/1/3/131379070/3769385.pdfIn PDF document text
    • https://fixojifuxupelo.weebly.com/uploads/1/3/0/8/130814076/titovexewo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413845/normal_6052fdfd7e7dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454821/normal_602f5ae20a553.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/bghaHjm/pimilexositipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_601fd38e80e1c.pdfIn PDF document text
    • https://nijeliwawinezim.weebly.com/uploads/1/3/4/4/134497061/9a574a701ffd.pdfIn PDF document text
    • https://gejowarog.weebly.com/uploads/1/3/2/7/132740172/namarosetawilavufano.pdfIn PDF document text
    • https://cdn.sqhk.co/talurelope/gaid1a0/balenciaga_black_sweater_mens.pdfIn PDF document text
    • https://noselarinagebep.weebly.com/uploads/1/3/6/0/136051947/3110a46f1a335.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_30e46c6504814c66898431e12426db36.pdf?index=trueIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_f839073bd3e74890b8ab4be47a3c2d7c.pdf?index=trueIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_51354d220c8a496e8cb4e282f366a59e.pdf?index=trueIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_72bc634f1c2b4c3cbc68e5f9e4279d49.pdf?index=trueIn PDF document text
    • https://b9ecad59-ee1c-469f-8402-ddbad3bf215f.filesusr.com/ugd/84dab8_e2f3c69be2204d64984d3546a8141172.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_off0000ea9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9C 5408 bytes
SHA-256: 75312453e736a7529983229a1dc28e2792b6010fdf2db93e3edf4b503b5a46cb
font_01_sfnt_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 10048 bytes
SHA-256: a95e29ebf4547fc5c370fb3f17a2dbb7441b75d6f276bb01e601ad1b207a8915