Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6b482c927dc859…

MALICIOUS

PDF

79.0 KB Created: 2021-03-28 17:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2db95e8b050f72e2d060b06c1c9c5986 SHA-1: 140b15b65e4d12813a6dfb8521e6ebf822292ad5 SHA-256: 8b6b482c927dc85982acbfae11b6c41bbeb7930227e4e80af244a31962cc0a82
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, with at least one, 'https://jacksth.ru/strik?utm_term=how+to+adjust+idle+husqvarna+chainsaw', appearing to be a lure for users searching for chainsaw maintenance information. The PDF's structure also indicates it functions as a link farm on disposable hosting, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=how+to+adjust+idle+husqvarna+chainsaw PDF link annotation
    • http://on-arenas.com/sezewavedelax9viz.pdfIn PDF document text
    • http://sayfelengs.space/724702884261fqmn.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/d2MWMxM/4510977324.pdfIn PDF document text
    • http://blog-uniswap.org/arduino_servo_datasheetjp8f6.pdfIn PDF document text
    • https://cdn.sqhk.co/perokokamosa/xijEhbg/lilutop.pdfIn PDF document text
    • https://cdn.sqhk.co/kogujipubap/fjehjij/paris_texas_apparel_owner.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388613/normal_603342dbc514b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446388/normal_5ff6921061cc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_6058e32cde8ca.pdfIn PDF document text
    • http://begdas.space/v2-v1_t2-t1_acceleration2bipl.pdfIn PDF document text
    • http://urro-hu.com/agilent_1100_hplc_purge_valvef9xo7.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421959/normal_6001942cb5026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485704/normal_6026b047a4cf0.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/cihjfhg/79037562882.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/bDThiEx/battle_heroes_mod_apk_android_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452863/normal_5fccb57410db9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408190/normal_5fcde24b5c5b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f47b090-4016-4903-8e50-1b483ad271d8/xokadozibaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/939e54b2-cda8-4b56-a78b-042977aad60d/diary_of_a_wimpy_kid_full_movie_free_online_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f8890f7-1eb1-41fa-8a92-d45b0e9de3fe/95653143696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cfc175d-953c-41bd-9a1d-a0ceebe5fc55/how_do_you_thank_customers_for_positive_feedback.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_off0000f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 5340 bytes
SHA-256: 31351cc2fa2ee786a0f1c7820f17852140ec17fbf0a8fb7672386db5d44e6379
font_01_sfnt_off000109ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 10732 bytes
SHA-256: 64a43d0e1cc69797f926a376e3c5fe6784bd6d8058fb19c9105c0b84eae0a578

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