Malicious PDF — malware analysis report

Static analysis result for SHA-256 a127b5cc7c922c8a…

MALICIOUS

PDF

70.6 KB Created: 2020-12-27 14:06:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e8466cef1d325cda09ce45d48cdcf99c SHA-1: e2f991afb919a6f84353af0e63a07b5b476038aa SHA-256: a127b5cc7c922c8a6eed827f9429a937382b7a5537e91643c0d454fa72be6d05
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One of the extracted URLs, 'https://traffine.ru/strik?utm_term=transferology+lab+login', is presented in a way that mimics a login page, indicating a potential phishing or credential harvesting attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffine.ru/strik?utm_term=transferology+lab+login PDF link annotation
    • https://tixosame.weebly.com/uploads/1/3/4/5/134523113/pozefovubo_punutinojam_manowof.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/0Pyhcha/ebay_gift_card_online_usa.pdfIn PDF document text
    • https://naduwabale.weebly.com/uploads/1/3/4/6/134651235/fijazejexivime.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445570/normal_5fe1b5902a745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464067/normal_5fc2dcea3af75.pdfIn PDF document text
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/9005303.pdfIn PDF document text
    • https://tofoboloronu.weebly.com/uploads/1/3/1/6/131636632/jamitizowiwuka.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/RhggcDG/81259649465.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nademopor/table_bootstrap_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c43894-032b-4ab8-8f8d-ffee84b49644/dino_run_2_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18fca007-3939-48f2-8e12-b3bc2c3b82a6/57019023231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03b5162-2b39-4776-a125-c5bc43adc522/linevawizugatanedomovanit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77280d46-8467-4343-b808-4193a674cebb/cincia_engenharia_de_materiais_call.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e2e756-9436-4457-a604-4fe42c3eb515/jaworimot.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/witcher_blood_and_wine_trophy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/578716a6-19fe-4c3a-849b-4136082942d0/jipusirizoleza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8acddc2d-2495-4f60-b3a2-67101b1f6142/1461118797.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD662 5128 bytes
SHA-256: 8500ac820e26eff71cce71b533e4a78562e5b5bcc970e98abd38308ca29ce466
font_01_sfnt_off0000e7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 11080 bytes
SHA-256: cab30f8b917958bed23a6d18776d37cd8496be314cfd802f4ef64edba803bfcc