Malicious PDF — malware analysis report

Static analysis result for SHA-256 7607db4bb5f4a3a6…

MALICIOUS

PDF

73.3 KB Created: 2021-03-28 04:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 35c364c972a667d23b6c7977de95ef9c SHA-1: eb67e33a07686cd902ae4b907990655c53f01ac3 SHA-256: 7607db4bb5f4a3a69914e51d9d2aeea016eedb5189352c6642404bed947e9627
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam tactic to drive traffic to potentially malicious sites. The document body, though heavily obfuscated, appears to be related to search terms for a book, reinforcing the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/award?keyword=ghost+stories+oxford+bookworms+stage+5+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421614/normal_602b424a3d10c.pdfIn PDF document text
    • http://baboguzaxeleju.mypressonline.com/52418884465.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481156/normal_6031706398bc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450340/normal_5fdfd7ecac0b9.pdfIn PDF document text
    • https://cdn.sqhk.co/tekunipifob/8hcigBH/15969169235.pdfIn PDF document text
    • https://cdn.sqhk.co/noradinez/fifVhgG/zixomoruzudijatox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408987/normal_603e5cc26b1b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482638/normal_5fffba8d91771.pdfIn PDF document text
    • http://finipupote.mywebcommunity.org/advanced_search_engine_optimization.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/40507863958.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392667/normal_5ff2e815bb314.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375088/normal_5fc7b163f29d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_b3c903d24a2c41768e098be07d1de5a9.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_218b8f6dd57d4358a3b99d73cc7bae5c.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_a0be082c6eb54b28b597652067c03cd9.pdf?index=trueIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_4397bfb583c54f688d363fff56e94dec.pdf?index=trueIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_ab0794b91b1d49c58f62a08ef238d2c8.pdf?index=trueIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_318eeae2985d46a3b6372200fbc5eb76.pdf?index=trueIn 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_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 5944 bytes
SHA-256: f078b1ae21bd8adcab0c1f7ab49b66cebea6e1148fb4c8beedbff102d65bd148
font_01_sfnt_off0000f180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 11396 bytes
SHA-256: c5015798e64ee8d67cd74e0b9684f374b44f49ca48709d852ff852682fe7762d

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