Malicious PDF — malware analysis report

Static analysis result for SHA-256 80907ca09d622fb8…

MALICIOUS

PDF

71.4 KB Created: 2021-06-10 01:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4645426082f2851431e246efa76f1d30 SHA-1: 6d3bcafd1c768588393a21b2e66e1888fd9bd173 SHA-256: 80907ca09d622fb8b2015c06141bc2d1e60da9ff620b839b8797b85c6170ebea
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/pbw?utm_term=french+revolution+essay+grade+10+pdf
    • https://mobafowowa.weebly.com/uploads/1/3/3/9/133997459/wozawexev.pdf
    • https://xubesizodumuruk.weebly.com/uploads/1/3/4/7/134703494/bevapaxirejev.pdf
    • https://cdn-cms.f-static.net/uploads/4464521/normal_60bf68d5c0d47.pdf
    • https://pasodevoz.weebly.com/uploads/1/3/5/3/135345373/6698f805da.pdf
    • https://julupeti.weebly.com/uploads/1/3/4/6/134608278/mavevadajul-zuzibuk-zapor.pdf
    • https://static.s123-cdn-static.com/uploads/4464078/normal_5ff8bdb572deb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5248a970-9b4e-4811-820f-7c24a0fc2965/suma_de_riemann_por_la_izquierda_ejercicios_resueltos.pdf
    • https://uploads.strikinglycdn.com/files/ec2a6502-f5f5-4672-8077-a37149999394/bijinafopibiku.pdf
    • http://funesut.pbworks.com/f/kakeibo_template_free_download.pdf
    • https://uploads.strikinglycdn.com/files/48bd9ab7-b64c-409d-bcd7-b0e9d48b1135/626388654.pdf
    • https://uploads.strikinglycdn.com/files/e7cfd986-052a-40ec-b547-999b707e3661/buturimo.pdf
    • https://uploads.strikinglycdn.com/files/e58ab4f4-9748-412b-b242-cafa479513ec/jotipokirip.pdf
    • http://lopofemusun.pbworks.com/w/file/fetch/144497610/67056457444.pdf
    • https://uploads.strikinglycdn.com/files/6a57fdb8-cf09-4f6b-905c-fe7befe67324/vubigib.pdf
    • https://uploads.strikinglycdn.com/files/623e262f-dc86-4989-a30b-9f7f01146480/jomogujewul.pdf
    • http://faxamom.pbworks.com/f/learning_style_inventory_questionnaire.pdf
    • https://uploads.strikinglycdn.com/files/9ec7f840-9e00-4c79-92d6-42eb8793a8a8/40054235230.pdf
    • https://uploads.strikinglycdn.com/files/56ac4a99-380d-4af1-8d24-aeffff4194a2/why_will_my_lawn_mower_start_but_not_stay_running.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_off0000d861.bin
fb99ec759eab1a68a1f095e93a134e236e63d4752f63f8bf084ce3909c8363fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 5728 bytes
font_01_sfnt_off0000ebf4.bin
d86fb9656a1400640161f5cbdd6da5baea663b9397dfd9125f8060608ba1cdd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 10724 bytes

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