Malicious PDF — malware analysis report

Static analysis result for SHA-256 3630c3b973216d86…

MALICIOUS

PDF

68.1 KB Created: 2020-11-22 08:49:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ece61974aaedfb93c47cfe096f090f30 SHA-1: adb239196daf66266f200fdb2fc39765e9431d3d SHA-256: 3630c3b973216d86bc65437704ff60ab6892550eefa229d3519fa5a11c3a4c80
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 0.9997

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://traffset.ru/123?utm_term=spotify+premium+apk+free+download PDF link annotation
    • https://kiriwalukejogof.weebly.com/uploads/1/3/4/3/134310578/dologubi-molamotugaz.pdfIn PDF document text
    • https://sazoxizifa.weebly.com/uploads/1/3/4/5/134505384/f62e93.pdfIn PDF document text
    • https://poxokisajape.weebly.com/uploads/1/3/4/5/134592502/df0949c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467593/normal_5fb6218fcc8b2.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/186bee3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377379/normal_5fb03e7796318.pdfIn PDF document text
    • https://veraweno.weebly.com/uploads/1/3/0/7/130739577/pobenirabexu.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/guvararuxo_dudiwuwavugog_modugejal_lebudeliwoxaz.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/12c1d618-a59d-45d1-a177-7bfd60c010b9/kutiximufifajudetexu.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/a_point_inside_to_the_left_of_the_production_possibilities_frontier_is.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57eb0f2b-d9c4-4ca9-9a43-02873693f788/37420705091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c3edddb-a495-496e-aec6-28f185112b49/building_codes_illustrated_downl.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_off0000cdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFB 5372 bytes
SHA-256: 285898ed5477ca0966cb7a805668fc7e8ccf08584e8313edb19c0e74623e82bb
font_01_sfnt_off0000e044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 10432 bytes
SHA-256: ab1f3fb20b3ffdc4344222a87c5d8643e8c7e5214534cb37b3836af96c005b38