Malicious PDF — malware analysis report

Static analysis result for SHA-256 952204916f219380…

MALICIOUS

PDF

87.1 KB Created: 2021-02-13 08:32:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 213b906ee6ac0cc4762dd6d55192b589 SHA-1: d56ae434d257f92270771d1ef298c6be2e688d9a SHA-256: 952204916f219380cc9baf65d0e29e5bc8c1a4faf153b0ad10233a91984e42ae
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to disposable hosting services and link farms, a common tactic for distributing malicious content or conducting phishing campaigns. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

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
  • 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://crophysi.ru/123?utm_term=what+is+the+imitation+theory+of+art PDF link annotation
    • https://xesudubivutomu.weebly.com/uploads/1/3/5/3/135303490/9700075.pdfIn PDF document text
    • http://air-calm2.club/315307191513jecv.pdfIn PDF document text
    • https://giwitororozesal.weebly.com/uploads/1/3/4/6/134652081/vadava.pdfIn PDF document text
    • https://cdn.sqhk.co/gilevetu/hbghvRS/international_free_calling_app_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_5fd2c5c74a391.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/jcuihHx/roxavema.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475854/normal_6008a8c1979b2.pdfIn PDF document text
    • https://taxonegumogel.weebly.com/uploads/1/3/5/3/135330056/mumaruzifadul.pdfIn PDF document text
    • https://cdn.sqhk.co/fewibefanid/gjRlrih/2020_nfl_football_schedule_excel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454432/normal_601c5bc2441c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405953/normal_5ffd869bd917a.pdfIn PDF document text
    • http://comp-arenda.site/pathfinder_character_sheets_paizochk1a.pdfIn PDF document text
    • http://natgood.space/suxubozoxuzotabulak237if.pdfIn PDF document text
    • http://natlab.ru/absorptive_capacity_theory8y1sq.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/jhhhb8N/battle_creek_michigan_area_golf_courses.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jokunikef.epizy.com/boundless_love_sheet_music_free.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

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_off00011a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9E 5088 bytes
SHA-256: f625398063818d45bff618d64cae8c843f88f5ec0f2be482f17db828a406d96b
font_01_sfnt_off00012bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD5 10468 bytes
SHA-256: 84bfadc74894cf9d460b2787b4a8fc8ad0518dacf4b1ae59b1802074cab24378

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