Malicious PDF — malware analysis report

Static analysis result for SHA-256 122227cd339b8c3a…

MALICIOUS

PDF

63.3 KB Created: 2020-11-27 20:15:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3203fdec4e6b9e9bd7012c318070146d SHA-1: d4ed86a5c18a0b94cbc8095de44698f0b9e7e817 SHA-256: 122227cd339b8c3ac3d56d89d95dc24a62d46a1bfc87e26a2bec0de461693354
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files hosted on file-sharing services, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/strik?utm_term=becker+intermediate+school+lunch+menu
    • https://wuviruwex.weebly.com/uploads/1/3/4/7/134766268/juteleg.pdf
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/nasubeluze.pdf
    • https://cdn-cms.f-static.net/uploads/4403131/normal_5f913455067b5.pdf
    • https://cdn-cms.f-static.net/uploads/4500674/normal_5fc04c5e45f00.pdf
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/5771643.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f77a9e0b-f478-487a-a4b9-b330e6f93033/tixapugibe.pdf
    • https://uploads.strikinglycdn.com/files/01080449-1040-47c0-ad4e-2ce7ea00cf53/when_was_the_color_purple_first_banned.pdf
    • https://uploads.strikinglycdn.com/files/a32f425d-328d-4ded-b2fe-9385c578d1fb/shrek_forever_after_torrent.pdf
    • https://s3.amazonaws.com/vukusa/38720913759.pdf
    • https://uploads.strikinglycdn.com/files/02d14e07-9ec8-4fef-a33a-5f7ef12a379c/63556817092.pdf
    • https://uploads.strikinglycdn.com/files/f77787a1-f366-4e1d-84a7-713b0eea5838/dofopavapaxupuja.pdf
    • https://s3.amazonaws.com/xupizewuxere/8346265230.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbdf.bin
a460071a360f19da1280d2a22f0b020a603a22ba9a593ed6850a72d4c711a813
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDF 5292 bytes
font_01_sfnt_off0000cdb0.bin
cefe326cb401331ca2f13777494c5ac98aea37cef5f8de170d0fdcd8db8045be
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB0 10264 bytes