Malicious PDF — malware analysis report

Static analysis result for SHA-256 267890deac2cb694…

MALICIOUS

PDF

67.6 KB Created: 2021-04-02 10:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e52d627ae561b0877f5f17eecee94715 SHA-1: 7217fd76ae1dc42fa3d498f93df76943aaf8675a SHA-256: 267890deac2cb694f9bdd21617a1013fbcd03314979bdc273f55a4ef3ec453b2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm. This heuristic, combined with ML and ClamAV detections, strongly suggests malicious intent, likely for SEO manipulation or to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://botokaw.ru/123?utm_term=bestwap+video+song++hd
    • http://zibepifutidi.sportsontheweb.net/jaxoxipudipinojun.pdf
    • https://cdn-cms.f-static.net/uploads/4458622/normal_600ea7d8dee49.pdf
    • https://cdn-cms.f-static.net/uploads/4410965/normal_600f5135b0073.pdf
    • https://cdn-cms.f-static.net/uploads/4473616/normal_601146a05a180.pdf
    • http://xupevagadozojad.22web.org/sistem_akuntansi_pemerintahan.pdf
    • https://cdn-cms.f-static.net/uploads/4417305/normal_605ff47acfa30.pdf
    • https://cdn-cms.f-static.net/uploads/4471230/normal_600ae09e92d86.pdf
    • http://kupimaxi.sportsontheweb.net/fatoju.pdf
    • http://jovepodixowofow.mygamesonline.org/sistem_akuntansi_pemerintah_daerah.pdf
    • http://tavafotuzefox.sportsontheweb.net/bepenepufawuf.pdf
    • http://kizunawinim.getenjoyment.net/lattice_points_and_space_lattice.pdf
    • https://cdn-cms.f-static.net/uploads/4492588/normal_604b6552a8a2a.pdf
    • https://cdn-cms.f-static.net/uploads/4384835/normal_600ea04438513.pdf
    • https://cdn-cms.f-static.net/uploads/4476593/normal_60471ef2ef6fa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bitines.myartsonline.com/advanced_java_programming_tutorial.pdf
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_61a4a22026ff46528d10dbb44041fad3.pdf?index=true
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_0ee6129c88d94cd7a91b5e28a6f75db8.pdf?index=true
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_81d29bf891ec425b9d6cd94ebb657377.pdf?index=true
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_6a191b87d38542dbb4c9cd36b61b7cb3.pdf?index=true
    • http://pasumogebono.rf.gd/multipart_form_data_json.pdf
    • http://xidozex.epizy.com/acidosis_metablica_hiperclormica.pdf
    • https://c4fca8c4-0f54-45c3-ae88-320069d86c16.filesusr.com/ugd/ac0d21_f959dcbd621c4845a8ccac228f39cfe0.pdf?index=true
    • 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_off0000cc33.bin
f54786be5bd87a20a4a74e11c02f10d92493bad1ad4aecc4e264acc49f6538b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC33 5296 bytes
font_01_sfnt_off0000de56.bin
f8c7b912018640a6ef8ddf350c2fa82036eef7305a1f4e3fb5e1a63f93a29f6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE56 10352 bytes

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