Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a24f0a8b6a63a84…

MALICIOUS

PDF

96.5 KB Created: 2021-05-29 04:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 85ff32ede73fc1098d619a286e3e11ad SHA-1: 99edb001ee77ac658d9c9b72aa00642c75c74c69 SHA-256: 0a24f0a8b6a63a8459e085cf4c058f686800f55f660e3a45767cdd322ff5a049
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified as a link farm, with the primary URL being a sports match report lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious or spammy websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/123?utm_term=valencia+vs+atletico+madrid+match+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404308/normal_606084a68241d.pdfIn PDF document text
    • https://dubamuxurel.weebly.com/uploads/1/3/4/4/134463085/9108713.pdfIn PDF document text
    • https://komolelavox.weebly.com/uploads/1/3/4/5/134518501/e73500ae2f86bd.pdfIn PDF document text
    • https://xetutimi.weebly.com/uploads/1/3/0/9/130968997/buwivuzokejuma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468261/normal_600ceed74dfc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_60357fc2d10e5.pdfIn PDF document text
    • https://watowerapomos.weebly.com/uploads/1/3/0/7/130775357/danurijel-tiwenarep-tavewomamo-tewiraxedizes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460471/normal_606c6da04051c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373757/normal_600ddb8d59e24.pdfIn PDF document text
    • https://taboxataxenigo.weebly.com/uploads/1/3/4/1/134108556/somoba_doxupitofet_lowesoxasepe.pdfIn PDF document text
    • https://jabexigiji.weebly.com/uploads/1/3/2/6/132695602/1313dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470683/normal_5fff674ba750f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496225/normal_5fcacb6c8514c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4379482/normal_60b1654499afb.pdfIn PDF document text
    • https://tizomejina.weebly.com/uploads/1/3/3/9/133997236/bdc22ed624a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450430/normal_5ffb3ff1db58d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402520/normal_6063e9d8abde4.pdfIn PDF document text
    • https://ruzoriro.weebly.com/uploads/1/3/5/9/135975417/9185540.pdfIn PDF document text
    • https://kuxobemif.weebly.com/uploads/1/3/1/3/131379353/3788847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391302/normal_606b2d6064b34.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/19263413-0866-4ffe-b9af-19f56eb29b13/15219000902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbe8f6bb-ab8e-4429-97ca-124f0f7d2996/72102614378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cc91b71-a567-4873-aa77-0c4a141d3255/magical_butter_machine_decarboxylation_decarb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb31d9b4-49a4-4ef4-80cd-1f50b927cce5/58640867992.pdfIn 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_off000137dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DD 5340 bytes
SHA-256: df3bd49c1d1fbe23970ed0d36605a8223429c2303eb42110b69d4277e19182a6
font_01_sfnt_off000149da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149DA 13100 bytes
SHA-256: 85c6136951dac0acfe2b4b1826119d43c4302ad9d54bb7c26252d4036e0efd4b