Malicious PDF — malware analysis report

Static analysis result for SHA-256 2998b6441481288d…

MALICIOUS

PDF

82.2 KB Created: 2020-11-11 10:41:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3e4b170827e3fb71866fbc1d701e399 SHA-1: dcb50e38e13e5f28b2d46342e3366f05a3296507 SHA-256: 2998b6441481288dea5eb672972acd7d0220260bd5cba71adcb6131712c14ab1
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on link farms, indicating a likely SEO spam or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs and the nature of the heuristics point towards a malicious redirector or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?keyword=mastering+embedded+linux+programming+2nd+pdf
    • https://cdn-cms.f-static.net/uploads/4393033/normal_5f9e93beaff8f.pdf
    • https://juleverut.weebly.com/uploads/1/3/4/4/134488806/topabubixex_pufakuxa.pdf
    • https://renikafajuwigag.weebly.com/uploads/1/3/4/3/134317319/6299d67e4c2ba.pdf
    • https://cdn-cms.f-static.net/uploads/4367952/normal_5fa361e79546f.pdf
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f8c3da26b1a9.pdf
    • https://cdn-cms.f-static.net/uploads/4371524/normal_5f890c800ff7a.pdf
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/1e86a6a171d.pdf
    • https://cdn-cms.f-static.net/uploads/4446016/normal_5fab0b28d2ea3.pdf
    • https://neriborotarisim.weebly.com/uploads/1/3/4/3/134345051/nadimadekuvex_giveni.pdf
    • https://tixoguwod.weebly.com/uploads/1/3/4/6/134694164/8831fbfcc3b.pdf
    • https://cdn-cms.f-static.net/uploads/4459323/normal_5fa7f55835ac9.pdf
    • https://cdn-cms.f-static.net/uploads/4447903/normal_5fa2b4944b3ad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101f7.bin
ebb2f916ca17a44b3583d3d866fd3dbae45f308a35372e2355b49316b41b2b2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 5708 bytes
font_01_sfnt_off00011557.bin
78c37e43d083f6a2a6c98d40f32bc651fdbf7d4ac33fe2b2ed9f2d14f7421f2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11557 11440 bytes