Malicious PDF — malware analysis report

Static analysis result for SHA-256 de17e61285658d9f…

MALICIOUS

PDF

75.3 KB Created: 2021-04-30 18:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be9afb8ab4a5d4b95bec6e659f91d93a SHA-1: bf87bede0bc1a35f9f1e0ac2b496ee1cc69ca37f SHA-256: de17e61285658d9f1d6500af3719ee27e441115c004d3a818f40257160ef03b5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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
  • 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://midufefew.ru/strik?utm_term=what+are+the+strengths+and+weaknesses+of+cognitive+behavioral+therapy
    • https://static.s123-cdn-static.com/uploads/4366676/normal_5fdfd3afc4fc1.pdf
    • https://vilujelirajoki.weebly.com/uploads/1/3/4/3/134378771/jagesudufin.pdf
    • https://cdn-cms.f-static.net/uploads/4376380/normal_5fd14c4ac5b6b.pdf
    • https://cdn-cms.f-static.net/uploads/4497081/normal_603e1bf2e64e1.pdf
    • https://cdn-cms.f-static.net/uploads/4503214/normal_60101523192cb.pdf
    • https://cdn-cms.f-static.net/uploads/4394060/normal_6036d6be91b84.pdf
    • https://pavonaxasove.weebly.com/uploads/1/3/5/3/135310158/4471073.pdf
    • https://cdn-cms.f-static.net/uploads/4496170/normal_605a09a511bd4.pdf
    • https://static.s123-cdn-static.com/uploads/4454289/normal_5ff50816b9d24.pdf
    • https://bujasosepamus.weebly.com/uploads/1/3/4/6/134626994/pokivazalogox_soxuz_xumel_nibutowapusa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sedowedi/maxovamomisidulerejifadu.pdf
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_b312b3ce502d41cb959968c6ed01a820.pdf?index=true
    • https://s3.amazonaws.com/zuwosil/zijawofibarizetek.pdf
    • https://s3.amazonaws.com/jagux/business_plan_presentation_ppt_templates.pdf
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_a2b66e81b34c4a8f930a0e0f85783d5d.pdf?index=true
    • https://s3.amazonaws.com/xirixepo/20615176133.pdf
    • https://s3.amazonaws.com/tojazudibumogab/94088506672.pdf
    • https://s3.amazonaws.com/rujabepifar/kenmore_washer_model_110_wont_spin_or_agitate.pdf
    • 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_off0000e81b.bin
f942c061282293a730156871af0beda1340d3f63dfbe1d824075d5d749211702		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE81B 5888 bytes
font_01_sfnt_off0000fc4a.bin
ced653d6a8a692f75ff16a096380655f37264a0ae87117d560e7ecb3f8b35e2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 10288 bytes

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