Malicious PDF — malware analysis report

Static analysis result for SHA-256 529b37477b00b45b…

MALICIOUS

PDF

132.1 KB Created: 2021-05-28 20:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 87c373ec598d0bc314baaa8a0c85c15c SHA-1: e10ff2b458efe848d23473d0d64dcad08ca3159c SHA-256: 529b37477b00b45b0fe69549e0a6dcf9a6c187e72510778a8c007db38fd62644
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, and one prominent URL related to 'zynga poker hack source code'. This indicates a link farm or phishing attempt designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/strik?utm_term=zynga+poker+hack+source+code PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494673/normal_606720aed0a34.pdfIn PDF document text
    • https://sugodaxekot.weebly.com/uploads/1/3/1/8/131872070/36517cbf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_60481b161a546.pdfIn PDF document text
    • https://dexugagemer.weebly.com/uploads/1/3/4/7/134715037/8936921.pdfIn PDF document text
    • https://bevifosadorafot.weebly.com/uploads/1/3/1/8/131856546/mijivixofip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406466/normal_605b0467ea30f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411931/normal_6037ea5201c60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452861/normal_604367f0b628d.pdfIn PDF document text
    • https://wukaxasupureje.weebly.com/uploads/1/3/4/4/134440875/6969825.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474723/normal_5fec7ce67c41b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415292/normal_6018c218ea84b.pdfIn PDF document text
    • https://tavigawatogup.weebly.com/uploads/1/3/5/3/135389884/534172b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373782/normal_60098daeea8a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464301/normal_6050eea6e490e.pdfIn PDF document text
    • https://suzotavuni.weebly.com/uploads/1/3/4/7/134765747/vazulasitaraxujesotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408990/normal_603a13432b25d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_60232dfa7e4b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462678/normal_6062baf7aa34a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/22319c9b-1e7e-4b4c-9510-b39a53febb74/mebijigemujor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96791f9a-7d76-4c48-8bbb-81cd1dbf48ad/how_to_crochet_a_scarf_with_2_colors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a5a35d-bb0a-48cf-be5c-ce40d71d9059/sipusifudefaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6068813-9fd6-4dfa-90a5-ade1eda30646/how_to_write_a_staff_training_manual.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_off0001c541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C541 5428 bytes
SHA-256: f4bbe0d3c36c9c3dd168444886c70e31da690ac93f7941c6e151a2db90b59041
font_01_sfnt_off0001d7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7C6 12492 bytes
SHA-256: 2a4e56447bafa53f64ca79438dbeed4ab7990fd8834652bd67bf2ddb12c420db