Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b52350f173d992…

MALICIOUS

PDF

79.6 KB Created: 2021-01-12 13:56:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ed07be002ccdbf44ab132e2010e15e0f SHA-1: e3b6edf8ceb40c3c0023de09106e954bd1d4f2b8 SHA-256: b9b52350f173d9927e66c21b0e4ce2378869cabd2ccdb82cd03db1d93c2d7d6d
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a 'Norwegian fjord travel guide', suggesting a lure. The presence of many external PDF links, including one to a suspicious S3 bucket URL, indicates a potential link farm or distribution mechanism for further 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
  • 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://ggtraff.ru/aws?utm_term=norwegian+fjord+travel+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4422161/normal_5fd647a48a80e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366625/normal_5fdefc2347485.pdfIn PDF document text
    • https://site-1172089.mozfiles.com/files/1172089/93879199099.pdfIn PDF document text
    • https://judikudaxu.weebly.com/uploads/1/3/4/8/134878276/0784a605.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/XZgg1q9/70200419112.pdfIn PDF document text
    • https://site-1180908.mozfiles.com/files/1180908/96134275708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373511/normal_5f8e0b2a100ad.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/gazitif/60953696615.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/10184845953.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/83311722803.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/lupus_nephritis_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/54195586134.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_off0000f91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 5092 bytes
SHA-256: 3e28a31fb1dfbfb972ef75b00bafde8476243751ccb05747da4e59fd6bf0812b
font_01_sfnt_off00010aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 11928 bytes
SHA-256: efa51fc2a1d504597da30d4f78542c7867f635aa6ebb326e5121ba4ce6c0fcb0

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