Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4dea73bdc5ea4ce…

MALICIOUS

PDF

67.7 KB Created: 2020-12-06 02:06:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fe3ebf8052dcb2b7ae05e10114c7187c SHA-1: 50f200191dfcebf55deb42efc68a26d75fe9107b SHA-256: b4dea73bdc5ea4ce48958565f2b1f5716b133a2a7d9df43472a9ceb1b6323fbc
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, including a known malicious redirector and a link farm, suggesting a phishing or malware distribution attempt. The document body, though partially corrupted, indicates a lure related to downloading a 'wifi adapter driver', a common pretext for malware delivery. The presence of embedded URLs and the ML classifier's high confidence score further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=adapter+wifi+windows+10+64+bit In PDF document text
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/wezedivafebiwad.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/7e7a39.pdfIn PDF document text
    • https://tutofegabosig.weebly.com/uploads/1/3/4/7/134725810/8470515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5fc071150e6fa.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/makumepaju-kewebovidibapub.pdfIn PDF document text
    • https://femobideja.weebly.com/uploads/1/3/4/7/134735935/noses.pdfIn PDF document text
    • https://murusezikarif.weebly.com/uploads/1/3/4/4/134436274/215e3f016.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd093bef3361272aedc33f/1606224189276/xiparomesonajanese.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/vipkhan_movies_bollywood_2017.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d6c88787e879896ba956/t/5fcc03fceb18547f4b705fbe/1607205890445/6871852908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3a3849-c6d1-43ee-b7bc-749a74a75e65/bizebijodonurokutibamo.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/63033807553.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0e5873299f0c543c277d/1606225497497/37889670504.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc141a05687f52b6b83892d/t/5fc3cdc6e6d49a06bb06bf0a/1606667719277/91480455736.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2c9392bbd74065812d409/t/5fc68c011972c46e3c82d18a/1606847490571/tudur.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_off0000ccc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC4 5660 bytes
SHA-256: 5d5711a82138bc543c47c7ddca246e8291bd683e6e593e4fb0df5a23c8ffba07
font_01_sfnt_off0000e02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 9828 bytes
SHA-256: 74db2f3664b1548e0911662efbbdb7cff69bdb1194be0f94deb67e527972bc95

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