Malicious PDF — malware analysis report

Static analysis result for SHA-256 9508a0078a135884…

MALICIOUS

PDF

131.2 KB Created: 2021-04-03 17:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7b70f92cd81c3a69ebb7b63fbb7020a SHA-1: 88e40954b513ba85152b2a91a3c9f412d495741a SHA-256: 9508a0078a13588448c4dd625eeade2e098aac11e5685a503adf16e7cfca29d0
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document may be instructing the user to open a password-protected archive, a common method to bypass gateway security. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jumiwimov.ru/award?keyword=livro+biotecnologia+industrial+pdf+download
    • https://cdn-cms.f-static.net/uploads/4365634/normal_602560c471eaa.pdf
    • https://static.s123-cdn-static.com/uploads/4487413/normal_6005c7cf5a3b2.pdf
    • https://cdn-cms.f-static.net/uploads/4374189/normal_60312e6dc3718.pdf
    • http://sizuxubotinukor.22web.org/universidad_del_tolima_sede_sibate_inscripciones_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4425933/normal_6053027f1bdca.pdf
    • https://cdn-cms.f-static.net/uploads/4486535/normal_60119c084dcca.pdf
    • https://sevipopiwipuf.weebly.com/uploads/1/3/5/3/135302768/6aca2dc049d1e.pdf
    • https://cdn-cms.f-static.net/uploads/4443608/normal_606097439bd18.pdf
    • https://dexexufadojobiw.weebly.com/uploads/1/3/4/1/134109071/birizadunogena-pisanekolima-musun.pdf
    • https://static.s123-cdn-static.com/uploads/4420037/normal_5fcebd5103280.pdf
    • https://lagomide.weebly.com/uploads/1/3/5/3/135304015/f893f.pdf
    • https://wajovojov.weebly.com/uploads/1/3/4/6/134652085/mamidu-mujiwamezexukan-zebixetegi-pagunem.pdf
    • https://pivuwolugere.weebly.com/uploads/1/3/4/0/134041199/tetigobumosudaji.pdf
    • https://static.s123-cdn-static.com/uploads/4382412/normal_5fcd95f09da8d.pdf
    • https://cdn-cms.f-static.net/uploads/4501045/normal_602525714f922.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dudulexo.epizy.com/2013_chevy_cruze_ltz_owners_manual.pdf
    • http://memugeb.rf.gd/wapaxanivovudezanebuti.pdf
    • http://notumaxesi.epizy.com/causative_intermediate_exercises.pdf
    • http://lapobikajedive.rf.gd/administration_of_justice_in_jurisprudence.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_off0001bedc.bin
03b2aeaa87e7e5c8e194b4665c10ad533220fc7d908a578f2333aca743449b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEDC 5556 bytes
font_01_sfnt_off0001d1e5.bin
0a1c2b163b517f187641b0518fe833d1d107417629c5aba344de03944641911e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1E5 15548 bytes

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