Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b40639854e8457e…

MALICIOUS

PDF

69.3 KB Created: 2021-01-16 02:05:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c74e04ada2653eb9805ecc1c7676d408 SHA-1: e4c43d812f5f62fa9c45c10de3dde4a45b29193f SHA-256: 9b40639854e8457ec7e82a5abf5de69ac1f9d77c407fef1b3df2010466176d9c
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links pointing to external resources, identified as a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://gettraff.ru/aws?utm_term=string+format+datetimeoffset+c%2523 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379855/normal_5f8a8a3c8feb0.pdfIn PDF document text
    • https://cdn.sqhk.co/bumadawab/tggsLib/dufedoruxazar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380700/normal_5fcf1fcd54578.pdfIn PDF document text
    • https://cdn.sqhk.co/gomiwopizi/ZSTighi/27076814700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f96ca18d02b2.pdfIn PDF document text
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/d0371e2db3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402707/normal_5fa4ce0da8294.pdfIn PDF document text
    • https://lepefolavexar.weebly.com/uploads/1/3/0/8/130874674/lamuzenakibosoj-vawitujo-fevim-tuzavirozutiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456372/normal_5feb50cc9f493.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415304/normal_5fc8b6ff73378.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/kavitokolezub/ranafamokogulonugemuboxiz.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/benchmark_performance_que_es.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/48906339079.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/zetum.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_off0000d0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B9 5412 bytes
SHA-256: f22f4667c9262c2710c1a982ae3958636da13ef54055da98922976e330988d3c
font_01_sfnt_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 11052 bytes
SHA-256: 64c2be48efbffe75b7d732fb029d08c477cc222124407c908a50476019d9803f

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