Malicious PDF — malware analysis report

Static analysis result for SHA-256 45412b54ba210aed…

MALICIOUS

PDF

85.2 KB Created: 2021-02-11 12:45:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: e13e7e57842fcdc1fdfc8cbaa56db283 SHA-1: 557f909d79cf47ffbe2bc14f381f37a342767733 SHA-256: 45412b54ba210aed3ec58cbec61ede14ac65d260e1d2f0d68f453ed70f877ea1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=florida+keys+cruising+guide PDF link annotation
    • http://1xbets-reg.site/super_smash_bros_ultimate_tier_list_maker_unblockedi5si7.pdfIn PDF document text
    • http://f13x.xyz/skoda_amundsen_2019_manualgiv8s.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/hlbifjh/2017_louisiana_football_recruits.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/pathfinder_eldritch_knight_guidelql7v.pdfIn PDF document text
    • http://silvanozito.online/carrion_crawler_5e_monster_manualtjc07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380228/normal_5fd907255bd21.pdfIn PDF document text
    • http://doordash.link/chevy_equinox_2018_manualolbt2.pdfIn PDF document text
    • https://cdn.sqhk.co/mofokamibe/hcwihcn/download_battle_plan_mod_apk.pdfIn PDF document text
    • http://lorenbayi.com/dunasulikolarukadulapnv7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449774/normal_5ff23fbc09398.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/mamukawaxatali/rigujovimu.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/asbestos_roof_sheet_cleaning.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/free_canon_digital_photo_professional.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_off0001109f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 5228 bytes
SHA-256: 970d06e32564a062ee5c60428ce3e35e8f04b207d70e67c69b1e951565c41d1c
font_01_sfnt_off00012286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12286 10884 bytes
SHA-256: 242185299f4311a37f195ab6c4260772262701c14299a385927e9247e6a09c26

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