Malicious PDF — malware analysis report

Static analysis result for SHA-256 51feb7c2d2a734fc…

MALICIOUS

PDF

69.9 KB Created: 2021-01-04 01:23:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b83a15dcda2b4c9ec4817e74867d26b7 SHA-1: 7d7e66e5f0dac73b01a2d712bc6985e0fa1eb92c SHA-256: 51feb7c2d2a734fc7aab00bac69b0294e9201fcd6b4b12ddb96206313d89c0c6
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating it is likely a phishing or malware distribution attempt. The embedded links, including one to a known malicious redirector, suggest the primary goal is to redirect users to harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, possibly leveraging embedded JavaScript for further actions.

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://traffking.ru/aws?utm_term=chipset+definition+informatique In PDF document text
    • https://static.s123-cdn-static.com/uploads/4449600/normal_5fe1035867769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f8e9529a9362.pdfIn PDF document text
    • https://pezusadoti.weebly.com/uploads/1/3/4/5/134525395/2120057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_5fdb2d96d9eda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366630/normal_5fccefa7dbce2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447265/normal_5fb5fee204097.pdfIn PDF document text
    • https://xedasijaw.weebly.com/uploads/1/3/1/4/131453620/fc973feb63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495550/normal_5fbb31be2d026.pdfIn PDF document text
    • https://jewelalebun.weebly.com/uploads/1/3/4/5/134585336/53c2bc191d83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390052/normal_5fad905744660.pdfIn PDF document text
    • https://xinifusat.weebly.com/uploads/1/3/4/3/134321574/5bf85d9eedc2557.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C8 5280 bytes
SHA-256: 36744fcb8cd5dda982820aef12e7eb9832beef605370f3c608020c1e92267aea
font_01_sfnt_off0000e686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 10888 bytes
SHA-256: f35a98a7beb0992119cb7a6fb1df5ca97b8a2c2776fa27029e57fb39987b58f4

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