Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f89205e31739cb8…

MALICIOUS

PDF

86.5 KB Created: 2020-12-22 21:57:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7537c47aad250feb6db4b8ce5a002746 SHA-1: dbb4fe28716102b85a6ca7e0c1ac9c7c8b788efa SHA-256: 5f89205e31739cb8f1d785763df7c220aa601ee1e7a7571ea985cddc87ad3c91
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to 26 external PDFs. The primary malicious URL identified is 'https://traffnew.ru/strik?utm_term=gold+armor+minecraft+use'. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing or trojanized nature. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffnew.ru/strik?utm_term=gold+armor+minecraft+use PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446264/normal_5fd83e1a170d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408172/normal_5fdc8a1dbc69f.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/b919b1ed8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387232/normal_5fbb810e104b1.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/5fdc9ff03a83d042422c3343/t/5fdce06ff242ab67f5514af8/1608310895821/bulldozer_driving_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad5d8176-8c55-4f1c-ac2d-e17dd4444580/memini.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3175ae2fce462bc9a424b/t/5fcaa2c425df3404b63f0849/1607115460738/daniel_tiger_s_neighborhood_explore_the_outdoors_dvd.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc294d0bda9c57a97c8e281/t/5fc3fb373f75b166434f6d82/1606679354624/wumus.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/83233103516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8563d9e-97d5-4ac6-8275-82f33c756606/58364820946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbdfdeb1-bc2d-45c3-b0e7-cead9cb4eda0/43152123814.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e24abd14ff0dd29c937a/t/5fce5c0f24c49707d3519ded/1607359514941/13807718836.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f5b088c99b6d37a76c18/t/5fc157b4cb3e0f577181a397/1606506421058/31252227213.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_off00011600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11600 5200 bytes
SHA-256: f497dd68963a672193241797cd92642d32439b36b8433a808782fecf611a03b0
font_01_sfnt_off000127a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A0 11088 bytes
SHA-256: 012c762e9dd07a79685a8413411be2c52e1814be7160e6687a64c0a276d7865b

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