Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb838370b6ee98a8…

MALICIOUS

PDF

105.6 KB Created: 2021-03-01 07:19:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3a312b5275cf13e4bcfb8eb2cebc83b8 SHA-1: 42141b85155945b0da6871308d28429064081a96 SHA-256: bb838370b6ee98a8ebd311d90c1fc5d8d12b886c7602d81b97065dd1714020c7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The document body, though heavily obfuscated, contains references to 'asp.net mvc dropdownlist set selected item value' and 'wkhtmltopdf', indicating it may be part of a scheme to drive traffic to specific search-related content or phishing sites.

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://lozipotod.ru/123?utm_term=asp.net+mvc+dropdownlist+set+selected+item+value PDF link annotation
    • https://cdn.sqhk.co/rowazazapa/fhjhcIZ/fast_park_charlotte_airport.pdfIn PDF document text
    • https://kisimerib.weebly.com/uploads/1/3/4/6/134697331/2267399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378623/normal_600a0e748c55c.pdfIn PDF document text
    • https://povurumupun.weebly.com/uploads/1/3/4/8/134884194/6845e43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_603957b43d873.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421970/normal_5ff78eeaf0649.pdfIn PDF document text
    • https://dukinuvofipul.weebly.com/uploads/1/3/2/7/132711936/5804538.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490367/normal_5ff808399be16.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/tai_chi_lessons_online_free.pdfIn PDF document text
    • https://laropavo.weebly.com/uploads/1/3/4/5/134585926/balogugenop.pdfIn PDF document text
    • https://cdn.sqhk.co/midijanere/zhaijVK/black_friday_deals_amazon_fire.pdfIn PDF document text
    • https://bunutawopuzo.weebly.com/uploads/1/3/4/8/134868528/limeronuj.pdfIn PDF document text
    • https://kenoduzuran.weebly.com/uploads/1/3/5/3/135350653/nasafo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368746/normal_6028ecf32fb65.pdfIn PDF document text
    • https://tufakuxumiwe.weebly.com/uploads/1/3/1/4/131454237/wupabokedoxexaneded.pdfIn PDF document text
    • https://senorori.weebly.com/uploads/1/3/4/6/134641151/4194464.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/Ork65jg/46927824866.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC2 5392 bytes
SHA-256: 97c628b2ca0d3a6ad69cf82fad1ecdd07cdc7365ede8c559b3d26c92a42618b7
font_01_sfnt_off0001721a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1721A 11292 bytes
SHA-256: 3995b64c9b5b3f4bce3fc0a054cbe63639001a977f9a19ab0563424bb95393e8

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