Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb79a9e823a0ae8e…

MALICIOUS

PDF

81.0 KB Created: 2021-01-06 10:57:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a3a282e6a87adc9c85dade91c5a611ab SHA-1: 6686194ec4edfae236bed987cf8df755b2d0ebec SHA-256: fb79a9e823a0ae8e9f5fafdd853d69d874a0e0f1937003ea0e746c5b67da57ca
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal a link farm strategy, with numerous external PDF links, including one pointing to 'traffnew.ru'. This suggests the document is designed to redirect users to potentially malicious websites, likely for phishing or scam purposes. No scripts were extracted, but the PDF structure itself is being leveraged for malicious redirection.

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
  • 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.
  • 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://traffnew.ru/123?utm_term=wheel+lock+pistol PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484624/normal_5fdcae781aab4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411245/normal_5fd90ea3733b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464056/normal_5ff38fc909768.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417128/normal_5fcf27f8cb99f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421350/normal_5ff0980fad91d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495257/normal_5ff50a35cc429.pdfIn PDF document text
    • https://gozikiri.weebly.com/uploads/1/3/4/4/134493270/mupazimadepejuduga.pdfIn PDF document text
    • https://wupizesave.weebly.com/uploads/1/3/4/5/134581048/1655389.pdfIn PDF document text
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/3839568.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/luramamelolem/chronic_renal_failure_nice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/wuxipedilegowa.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/mosevele.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_off000101dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 4792 bytes
SHA-256: 450aef93bced79ffd4d19859544c3a48c77712a44b1be5e2d22befb1c0ce5b7e
font_01_sfnt_off0001123e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123E 11036 bytes
SHA-256: 2280fbbce8673309ba6d2207dacac6cf29050f3ebde62272c150ab44ce247af2

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