Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d944e35de8a9f1…

MALICIOUS

PDF

70.3 KB Created: 2021-01-01 17:01:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f8bee085ed4591ab38ef98fc7007d9cd SHA-1: dc50b80034ffc54a0013b019eb3546cc4582ec82 SHA-256: f8d944e35de8a9f1ddb2364c251d0a59c30a21127d0a8332ffdbf629fbad3971
214 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO spam or phishing pages disguised as documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/123?utm_term=flight+training+manual+pdf In PDF document text
    • https://cdn.sqhk.co/sezepemanu/WihTome/mewe_sleep_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470019/normal_5fba78ce807fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_5f8b8fe5829df.pdfIn PDF document text
    • https://cdn.sqhk.co/kukojuvata/Wchlhig/fakaxazonaj.pdfIn PDF document text
    • https://wamurereleveti.weebly.com/uploads/1/3/5/3/135392703/kapikolurobibetepume.pdfIn PDF document text
    • https://cdn.sqhk.co/sozovifena/c3FhhNT/3169319623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455375/normal_5fbc1b33c6115.pdfIn PDF document text
    • https://cdn.sqhk.co/sofaxuleruri/LrgeDsO/falitokotavateruzurom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_5fd27e7b50d02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388627/normal_5fe6280f5df96.pdfIn PDF document text
    • https://cdn.sqhk.co/joxutedunik/fKOgeP3/32097155390.pdfIn PDF document text
    • https://cdn.sqhk.co/buwowunuras/bWgizjh/caulipower_margherita_pizza_ingredients.pdfIn PDF document text
    • https://cdn.sqhk.co/tusumawibe/pgfDNWN/12925228145.pdfIn PDF document text
    • https://danawejenig.weebly.com/uploads/1/3/4/4/134499985/geguzemu-zuset-vabikix.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/fd9b5665-7ecf-4a3f-a5db-af364ceddf3e/majinasebegin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77778ffe-5321-4983-ba4a-83c66e718c2f/iron_body_ninja.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_off0000d5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B4 5232 bytes
SHA-256: 5de2d8ba0df123be2dee326e4a6fc55f3fdd75cfea3b4f1c78daa2040faf9dfd
font_01_sfnt_off0000e75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 10936 bytes
SHA-256: b61e4469f5e063fd3ff41d1dbfe42cc05a4d08b61331dd475561927757fafba1

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