Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a2a35d2714281a…

MALICIOUS

PDF

81.8 KB Created: 2021-04-10 09:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3482a126140611477452d7d9ad14d037 SHA-1: 816e60d8d098c0462e962e0f95a1d99d94af01ac SHA-256: 35a2a35d2714281a6e60b6b7334b400d67723cc5a1c75f573d5b6a97ac60fee4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern. No scripts were extracted, but the overall structure points towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/strik?utm_term=doctor+sleep+book+publish+date PDF link annotation
    • https://cdn.sqhk.co/sadirorig/3yuQij4/12007400008.pdfIn PDF document text
    • https://supesitibozuxo.weebly.com/uploads/1/3/1/4/131454850/dikivabisekoj.pdfIn PDF document text
    • https://lemabifi.weebly.com/uploads/1/3/4/3/134319461/betaloziniruvumenale.pdfIn PDF document text
    • https://dodesagetulisuv.weebly.com/uploads/1/3/4/9/134902864/gojexopavopimaloti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411708/normal_601522f940813.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461250/normal_5fdd19bb552ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422643/normal_605f7c59c9b76.pdfIn PDF document text
    • http://fawaxifiwuzodil.scienceontheweb.net/wukigupim.pdfIn PDF document text
    • http://gnatural.space/william_faulkner_barn_burningegrrh.pdfIn PDF document text
    • https://cdn.sqhk.co/xuteposidobi/ZhfAlgj/id90_travel_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481831/normal_60556194e7cb6.pdfIn PDF document text
    • https://lepamatizetu.weebly.com/uploads/1/3/0/7/130739269/tewulexeriwik-vovipesijo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481985/normal_606a312726132.pdfIn PDF document text
    • http://optamorem.com/livro_de_zoharar1zv.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/5869446.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzutuse/MigXjhY/gunej.pdfIn PDF document text
    • http://islandlandscapesbb.com/wd_my_cloud_customer_service_numberarnsr.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://baboguzaxeleju.mypressonline.com/29702881037.pdfIn PDF document text
    • https://tonewebebajuja.weebly.com/uploads/1/3/5/3/135319275/fuved-numadataber-latipuw-wazume.pdfIn PDF document text
    • https://nejotadig.weebly.com/uploads/1/3/1/1/131164569/3085824.pdfIn PDF document text
    • http://securityverifiedservices.com/27432958945bx7r3.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/psyicjh/brazil_football_world_cup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 5364 bytes
SHA-256: f988543059c201a1dd21063802c7184ae97bd902bbe96b54b99aa5ca688487bb
font_01_sfnt_off000112b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B9 11496 bytes
SHA-256: 0a2fc07515d7ec1c1d132336260e3df0f9dd0bed5fe3ff80f84bbc4f2a116a1a