Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d534268af7a28c…

MALICIOUS

PDF

69.7 KB Created: 2020-12-11 07:34:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 555f2cb5807c5f99329928a146bf8e3d SHA-1: dbb806db27c8b4ae87c269de3e29c2f98aa0d412 SHA-256: 45d534268af7a28c11d1674e2a0641215f4c26a9f256b6f1fa5fb8f77a6cd728
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF documents. The heuristic 'PDF_SEO_LINK_FARM' and the presence of many unknown reputation URLs strongly suggest a malicious intent to manipulate search engine results or direct users to potentially harmful content. The ML classifier and ClamAV detection further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=minecraft+silk+touch+spawner+data+pack+1.15 PDF link annotation
    • https://wodorolijuzawex.weebly.com/uploads/1/3/4/7/134770742/0686142b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487187/normal_5fc518c3b8e62.pdfIn PDF document text
    • https://rajomiluti.weebly.com/uploads/1/3/2/6/132682989/2505118.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393508/normal_5fc91b261c2cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370764/normal_5faa578b2a162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392660/normal_5f943f887a33d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377928/normal_5faf591d82d1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421944/normal_5fc1d3153662a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc0e80068612547ed5e2b99/t/5fc3340408845d0924f2061c/1606628357585/didutumasupirexebej.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB0 5492 bytes
SHA-256: 07cdf0be2d59b276b3504106acafeed5268400c0599ca4e1c6a3825c0e314b8d
font_01_sfnt_off0000c170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC170 10344 bytes
SHA-256: 841543127fbf71375ae56338d13c5fb65bbd2bcc71961e1ccd1ef93a3d2b5ecd
font_02_sfnt_off0000e50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50F 16064 bytes
SHA-256: 8ce0575abc6f686af3c1393089841c21814f5c4838d5adbe0d649219e58da802
font_03_sfnt_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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