Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5d168d8c556027…

MALICIOUS

PDF

67.1 KB Created: 2020-11-21 03:02:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3f69b92cee3f2da02f57604d23028211 SHA-1: 7435b1b0df14e11c2a6f1ef17b6d82a9eb129cb3 SHA-256: aa5d168d8c556027ee618f123bb8b13d3e232d11471a9702437798446eb18ffa
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, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs, such as 'https://gettraff.ru/123?utm_term=darlington+county+deeds', are likely used to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/123?utm_term=darlington+county+deeds In PDF document text
    • https://momaramurelu.weebly.com/uploads/1/3/4/3/134309976/eb67cdc9.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/8262762.pdfIn PDF document text
    • https://sizojupitad.weebly.com/uploads/1/3/4/3/134332657/13187141b99.pdfIn PDF document text
    • https://solezoxi.weebly.com/uploads/1/3/4/6/134654925/9cbaa63beef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/95403896742.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/24119529153.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/49287701573.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/setixemud.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/14948965683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd97ffe-83c9-4d11-ae48-d2800a4862d8/16368150283.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/zerimepif.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/zelorexome.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_off0000c519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC519 5208 bytes
SHA-256: 3138dc4be1f1aae316095e820e0d7d96cc4c73ff067c418d332d46940400495a
font_01_sfnt_off0000d6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6ED 11488 bytes
SHA-256: 1123293e708663d88e7fe652807d39001a25a7c130d279a7cd82302b27d4e9d6

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