Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d699bad9e58a64…

MALICIOUS

PDF

56.7 KB Created: 2020-12-19 09:12:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 937d0eb7b857f34573a0fba7d260e7f7 SHA-1: 627fb13235a2c937f37f7d3ede3119de0255585b SHA-256: 54d699bad9e58a6499560c126ab128c0655dfbaadf9c5d1245cc36363b539903
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://trafftec.ru/123?utm_term=jebsen+taylor+hand+function+test+espa%25C3%25B1ol PDF link annotation
    • https://sipesavuw.weebly.com/uploads/1/3/4/6/134697333/lawikotazavu.pdfIn PDF document text
    • https://kikuvabafot.weebly.com/uploads/1/3/4/3/134332304/0ae2c3.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/17500c0.pdfIn PDF document text
    • https://disanelazutiwi.weebly.com/uploads/1/3/4/3/134361230/zibigolomex_binez_pugifubizopajew_vufiwadazu.pdfIn PDF document text
    • https://xasigevas.weebly.com/uploads/1/3/4/5/134595911/libuzimenizexosug.pdfIn PDF document text
    • https://jesebumu.weebly.com/uploads/1/3/4/6/134617302/4963126.pdfIn PDF document text
    • https://zegexexu.weebly.com/uploads/1/3/4/3/134385137/buvuwula.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/dazutun/cheats_for_need_for_speed_carbon_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50c2205a-a1ac-4e7f-bf70-6d31f81b768e/pitman_probability_solutions_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/16341045205.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_off0000a4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4B5 5688 bytes
SHA-256: 92558a07615e770ce7d3c7fd192975e9bbb0f46178054d7726344ce28f4178a2
font_01_sfnt_off0000b7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C5 8224 bytes
SHA-256: 7757fe857ed9b507c5d8a6197ecc262bf236d17952db445b9be263c5df89ee57