Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4f97acacfb0e4c…

MALICIOUS

PDF

79.4 KB Created: 2021-05-26 05:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb4e2929ae499ef7f042b692a63c983a SHA-1: 9c9dc5ba12dce789049f7d576baaa2b76aa51e42 SHA-256: 7c4f97acacfb0e4cc3a901e64d327cad96137155be7ca916df6ceed231172164
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing campaigns, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to "Callaway xr driver adjustment chart". The presence of external URIs and the ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/strik?utm_term=callaway+xr+driver+adjustment+chart
    • https://kuburabet.weebly.com/uploads/1/3/4/3/134362545/juwezovulos.pdf
    • https://static.s123-cdn-static.com/uploads/4467573/normal_5fd07a0c3f38b.pdf
    • https://static.s123-cdn-static.com/uploads/4505699/normal_5ff258054c14f.pdf
    • https://dovenokitumenu.weebly.com/uploads/1/3/1/4/131482991/segubokubusakokekid.pdf
    • https://varowuzogan.weebly.com/uploads/1/3/1/8/131856285/3787868.pdf
    • https://cdn-cms.f-static.net/uploads/4376869/normal_604d102f73b9a.pdf
    • https://lakofureluv.weebly.com/uploads/1/3/4/6/134632848/eb335c1f2c.pdf
    • https://tofabefanij.weebly.com/uploads/1/3/4/7/134726630/julukadivuli.pdf
    • https://daxivikulogator.weebly.com/uploads/1/3/4/3/134308382/ledetoz.pdf
    • https://tediresul.weebly.com/uploads/1/3/5/3/135345321/muzuwosa.pdf
    • https://cdn-cms.f-static.net/uploads/4477921/normal_60276677462ec.pdf
    • https://mebusogaduvorit.weebly.com/uploads/1/3/0/9/130969439/8591296.pdf
    • https://vejamepune.weebly.com/uploads/1/3/0/7/130776484/75ed08138e3f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/befafuni/53555815202.pdf
    • https://s3.amazonaws.com/kufazete/51087025377.pdf
    • https://uploads.strikinglycdn.com/files/f7993a9c-82d0-4ff6-883e-bc19585a1be4/charlas_diarias_de_seguridad_motivacionales.pdf
    • https://s3.amazonaws.com/mojivikapeti/gegaso.pdf
    • https://uploads.strikinglycdn.com/files/8521fcbc-cca5-40a4-b609-91456c6039dd/apc_back_ups_es_550_flashing_red_light.pdf
    • https://s3.amazonaws.com/takurugilij/65992048001.pdf
    • https://s3.amazonaws.com/vapite/how_to_reset_canon_speedlite_430ex_ii.pdf
    • https://s3.amazonaws.com/rikolesafuwofar/50520299322.pdf
    • https://s3.amazonaws.com/tirimofufemukat/ketimomopikafogonasibede.pdf
    • https://s3.amazonaws.com/zobuwubedak/bole_chudiyan_song_free_songs._pk.pdf
    • https://s3.amazonaws.com/legobegutulo/a_plastic_ocean_worksheet_quizlet.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_off0000f687.bin
acc9a1fc9d74463fae91d3593618c483ee059664ef4da3607bbed31381a8e04a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 5484 bytes
font_01_sfnt_off00010921.bin
5b8f635c17e1ef279021fd057a14f1a0c9068751214bfd2fb033a9ce6360374e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 10880 bytes

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