Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6360bbbb939548…

MALICIOUS

PDF

73.2 KB Created: 2020-12-24 21:37:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 88317d5dd12892354f826505b5eed000 SHA-1: 0b0d7ffd50815e7b5648bd8507c4ee621e95a6ea SHA-256: dc6360bbbb939548dd8291f2da75d325a3351dbc01566aeb2a7c472e60c95f7b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded content, though heavily obfuscated, appears to be related to the search query "How long does coffee increase heart rate", indicating a lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/strik?utm_term=how+long+does+coffee+increase+heart+rate PDF link annotation
    • https://rizenorugeworo.weebly.com/uploads/1/3/4/3/134379336/4571272.pdfIn PDF document text
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/3690011.pdfIn PDF document text
    • https://fopepusev.weebly.com/uploads/1/3/1/3/131383694/nudivemelafisevojiz.pdfIn PDF document text
    • https://xizukuzu.weebly.com/uploads/1/3/4/6/134606793/galaji.pdfIn PDF document text
    • https://cdn.sqhk.co/dubezaxuviz/givQifN/86460936359.pdfIn PDF document text
    • https://ligibumifi.weebly.com/uploads/1/3/4/6/134647936/lexadakonenovuw.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/lejivugeleguwod/satezufuxigedebikow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3182dd7-bae1-41ff-8f8f-b4e60848eabd/tamu_rec_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/667fcea7-a369-4638-b787-04c977f113ba/54147124309.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f882eef3-f9a1-4f11-ba8c-2944c976145e/xagipevekila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/320446bb-ea1f-45dc-9b4d-ea9ce8ec353f/peoplepublicrecords.org_license_plate_free.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_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 5336 bytes
SHA-256: d4d90ba7064456ee5c4fe2e94af8fcdd725e3b507df47fa11d80a9367848caeb
font_01_sfnt_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 11304 bytes
SHA-256: a179a4ee940de5118632b381ca835d8757aafb8064480331e4df38b2250bb596

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