Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a9d09b6a19c208…

MALICIOUS

PDF

60.6 KB Created: 2020-12-24 12:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eec0f8488aee8f574a07ec71afd1e451 SHA-1: 751ffd8444dceaf76b298dfb11a23541ad3cfdb4 SHA-256: 19a9d09b6a19c20812ca9b24ddbf20dc68335864155ad6e2e296da0d8ba87e4c
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/strik?utm_term=austin+mahone+ringtones+free
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/93430.pdf
    • https://wagimudo.weebly.com/uploads/1/3/4/4/134475497/wukotisuvufer.pdf
    • https://wusoxebuwewete.weebly.com/uploads/1/3/4/4/134432123/b6e4ee2a98a4e.pdf
    • https://cdn-cms.f-static.net/uploads/4471467/normal_5fbbbf4c3cc11.pdf
    • https://cdn-cms.f-static.net/uploads/4384832/normal_5fa3580cec193.pdf
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/fitadotanasokob.pdf
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/7992784.pdf
    • https://toxisejaris.weebly.com/uploads/1/3/4/8/134851702/4017641.pdf
    • https://pilidikuvitas.weebly.com/uploads/1/3/4/7/134766888/1320b8.pdf
    • https://static.s123-cdn-static.com/uploads/4378831/normal_5fce875616813.pdf
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/a93ff760a456.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2b5.bin
738ef2d4d5a5f14758ed05dae8f9770ae79f41e84247dd8653cc076c1ecfb246		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B5 5136 bytes
font_01_sfnt_off0000c403.bin
92fa7dcd7e18b371442518f9d431d76bd362ddb0bbfac5a009221bed1257ca69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC403 10024 bytes

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