Malicious PDF — malware analysis report

Static analysis result for SHA-256 409f85df9b963c9c…

MALICIOUS

PDF

90.2 KB Created: 2020-11-10 22:10:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d59a7ac99b9163486e9100bf9565db59 SHA-1: 77a07fd332c2055d45d405829cc48c6e20cfbec8 SHA-256: 409f85df9b963c9ccc5831efdb5d3236651862ecd3268e3607408d539295493b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the primary goal is to redirect users to malicious websites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/strik?keyword=minecraft+shadow+step+enchant
    • https://xixivejeb.weebly.com/uploads/1/3/4/6/134603549/pamibusigejojev.pdf
    • https://sapakokejepudig.weebly.com/uploads/1/3/4/4/134457578/ranipoganifizer.pdf
    • https://bujubisagakib.weebly.com/uploads/1/3/4/3/134323903/9892318.pdf
    • https://widobane.weebly.com/uploads/1/3/4/3/134340358/34327.pdf
    • https://tedenugimug.weebly.com/uploads/1/3/4/3/134345185/1510588.pdf
    • https://guzarimu.weebly.com/uploads/1/3/4/6/134608133/5c5f71f71e4c83d.pdf
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/zuxizakabe.pdf
    • https://nolaguga.weebly.com/uploads/1/3/4/3/134307058/kulobevizigofe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c6b332ad-e6f6-49fa-86c6-6a460153c0a1/bitasu.pdf
    • https://uploads.strikinglycdn.com/files/ca817e51-674a-4c21-a541-8717a9f4f33d/bopowepebawo.pdf
    • https://uploads.strikinglycdn.com/files/efce4235-fc4c-4591-99fe-fb6573181643/6655204067.pdf
    • https://s3.amazonaws.com/susopuzupure/puxipipusew.pdf
    • https://s3.amazonaws.com/tawosutosuxi/pseudolus_plauto.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d92.bin
798f464e1bc3f5fba9fbc536783ad878940950c0b57c300ad919a151522af219
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D92 5308 bytes
font_01_sfnt_off00011fbd.bin
8ecf0f02dd8f0dd50fd6e01bd19ef9f7f9b2cc9d638b3e1da3f13ee427efacdc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBD 10916 bytes
font_02_sfnt_off0001456e.bin
6f41d85279102efce3c4bd26fddb767baf9b68a4f55e239fba9bedc2a2d3b953
pdf-font-stream PDF embedded font (sfnt) at offset 0x1456E 16064 bytes