Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c416a29caa6b41…

MALICIOUS

PDF

69.2 KB Created: 2021-02-09 12:05:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d67b5cf08075577a32c3060244c8d4ee SHA-1: 61ec80b4f75ad5fa81094e3c79d8ea41debf5b17 SHA-256: 40c416a29caa6b41d64e531b22569b17f27a79050c38a1d787851023c0efbf8a
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external URLs pointing to various domains, many of which are disposable. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan PDF. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

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://druttle.ru/wb?keyword=aggregate%20impact%20value%20test%20astm%20pdf PDF link annotation
    • https://cdn.sqhk.co/nabixisaf/jaih1AO/talking_john_dog_frozen_city.pdfIn PDF document text
    • http://f13x.xyz/julafirenukifuxivupopelun3lemd.pdfIn PDF document text
    • http://opticsystem.website/luguzqz4xb.pdfIn PDF document text
    • https://soliduratop.weebly.com/uploads/1/3/2/3/132303261/9406860398a6c.pdfIn PDF document text
    • http://vbruti.site/bawugi00a0a.pdfIn PDF document text
    • https://cdn.sqhk.co/dodazija/2IThdUi/cute_pokemon_eeveelution_wallpaper.pdfIn PDF document text
    • https://lugifepitel.weebly.com/uploads/1/3/2/7/132710690/398040.pdfIn PDF document text
    • https://nitegira.weebly.com/uploads/1/3/1/0/131071289/bokugifelatarub.pdfIn PDF document text
    • https://cdn.sqhk.co/wovovoteg/eRgj5hg/85451817067.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwasazafu/VkdigjH/cosmoprof_hours_today.pdfIn PDF document text
    • https://jabibodusap.weebly.com/uploads/1/3/2/6/132681053/dilufulupubanomat.pdfIn PDF document text
    • https://dijuwinepogiw.weebly.com/uploads/1/3/0/7/130738679/jedenutikakux.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/gchajfc/25953307801.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/jinabisura/performance_all_season_tire_comparison.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/finding_perimeter_of_2d_shapes_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/lumitabibovuburuvuxed.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/tarazufavaxodidirux.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/dojo_loach_care_guide.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_off0000d15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15F 5524 bytes
SHA-256: 88f7e0691b5dfbd3cbb8889c1cec014dd876ade95e207804245e1a5387ed4c44
font_01_sfnt_off0000e41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 10456 bytes
SHA-256: 55011b230a72aed8832257a35cefb30ba41e76da75e254a8f2a873a29e070121

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