Malicious PDF — malware analysis report

Static analysis result for SHA-256 920da1187c112c9d…

MALICIOUS

PDF

73.4 KB Created: 2021-02-13 21:45:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1a4ecba07cba20997fcd73a7ebf56f39 SHA-1: d278ac251cd1b34090e718112873006d44df29c2 SHA-256: 920da1187c112c9d775c4d804a0d1b22c3aa7ce1a3f5b325e51e4f371957fc74
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to what appears to be SEO-optimized content farms, with one specific link identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=fiat+test+study+guide+pdf In PDF document text
    • https://cdn.sqhk.co/pivokazi/jhidDge/42277025976.pdfIn PDF document text
    • https://gitodaxip.weebly.com/uploads/1/3/5/9/135960033/adcdba9468e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473379/normal_5fd64c11e620a.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/ohihgjj/kubicle_promo_code.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413583/normal_5ffa93d3106eb.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/OCiaDhi/63302367573.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/hdjdyih/lojajaluradigilusujux.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/Oijd9ib/amazon_alexa_dot_app.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/gonafoziguwewe/regedaxuvufo.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/84785775179.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/74979762687.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/33757591024.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/romawet.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_off0000e3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C2 5136 bytes
SHA-256: 36cde37120af8faef8e46a7d4d7c86eab3f40be414288b693e33a7ed0055497c
font_01_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 10476 bytes
SHA-256: 8c28b8d4b37cd4000b4e57d4c9ad3a45b4739bd4955d65faf3c1adcb0cc102cb

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