Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c88ed64b657bbc8…

MALICIOUS

PDF

75.3 KB Created: 2021-05-30 08:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bef81849e034561e5f45db42d182fa6 SHA-1: 95b80f833d9931d6a22a818cfac9e7911723e3af SHA-256: 6c88ed64b657bbc8f55d41e144312f45d219eac545661b4a2a1b11f78bd080e8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://midufefew.ru/123?utm_term=spider+man+game++offline
    • https://static.s123-cdn-static.com/uploads/4477886/normal_5ff0f4c16dee5.pdf
    • https://jixepelisu.weebly.com/uploads/1/3/2/6/132695865/3169633.pdf
    • https://static.s123-cdn-static.com/uploads/4416940/normal_6001cc6069e67.pdf
    • https://vetedikagumon.weebly.com/uploads/1/3/1/4/131453784/vetivupuv.pdf
    • https://jomunibudax.weebly.com/uploads/1/3/4/3/134342604/debba1.pdf
    • https://megogolu.weebly.com/uploads/1/3/4/3/134314378/depeze.pdf
    • https://cdn-cms.f-static.net/uploads/4393628/normal_604fe98bd8a90.pdf
    • https://kitopelok.weebly.com/uploads/1/3/4/3/134355781/wegawavikakuxexewuw.pdf
    • https://janososa.weebly.com/uploads/1/3/5/3/135326085/170257.pdf
    • https://static.s123-cdn-static-d.com/uploads/4417308/normal_60b30ac313067.pdf
    • https://cdn-cms.f-static.net/uploads/4408595/normal_60617d837c928.pdf
    • https://cdn-cms.f-static.net/uploads/4488569/normal_60417e5db869e.pdf
    • https://cdn-cms.f-static.net/uploads/4402963/normal_601dc8265b6ee.pdf
    • https://sobugegebo.weebly.com/uploads/1/3/4/4/134489054/891febdf57811.pdf
    • https://valiwuvubeke.weebly.com/uploads/1/3/4/6/134694219/pamag.pdf
    • https://lixabexuraluna.weebly.com/uploads/1/3/4/2/134234562/xewerej.pdf
    • https://rifuxegu.weebly.com/uploads/1/3/4/5/134525143/86489ac3.pdf
    • https://fivoputan.weebly.com/uploads/1/3/1/4/131408393/pamimulib.pdf
    • https://sigajijatikad.weebly.com/uploads/1/3/1/3/131379485/4923990.pdf
    • https://sewimoranekodov.weebly.com/uploads/1/3/0/9/130969375/6482dd0f6efb55.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d54bd85f-283d-49ce-80e9-a2813d662ea0/dokezeti.pdf
    • https://uploads.strikinglycdn.com/files/256542d8-7e51-441d-886a-a353dc9dc364/45250411075.pdf
    • https://uploads.strikinglycdn.com/files/1e5e3e46-247e-49c6-b38c-f5f74fc4d467/how_can_a_skinny_person_gain_weight.pdf
    • https://uploads.strikinglycdn.com/files/2d8d658c-fc96-4f0d-9f87-909f2a315a6f/fasikagomejevobupozepemu.pdf
    • 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_off0000e9df.bin
ce3e7068d4abbd9ba4cbe982b233fa174d958a3f55e1386e91675c20dfd21cab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 5288 bytes
font_01_sfnt_off0000fbc4.bin
d769c862b1c018b73093cf6562cd42a0d7011dee20b976fc5fcc743151ccbd3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 10724 bytes

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