Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a92f388e48ba20…

MALICIOUS

PDF

76.3 KB Created: 2021-03-20 03:58:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ca6af310f3075cb917bad29aa4b2876a SHA-1: 8ead0b1849edf55f666d510f5b44167ad0ab683c SHA-256: 50a92f388e48ba202fcb09378a78038edff04a70001ded98ca0865c07b8af26c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. The presence of external URIs like 'https://pelibifir.ru/award?keyword=automotive+abbreviations+dictionary+pdf' and 'http://qlemelest.online/sewawuvikubebubokalivipugb4c1.pdf' indicates the file's primary function is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/award?keyword=automotive+abbreviations+dictionary+pdf PDF link annotation
    • http://qlemelest.online/sewawuvikubebubokalivipugb4c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487618/normal_5fc963087398f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464297/normal_600e5fe193fe3.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/attack_on_titan_anime_manga_correspondence4a05s.pdfIn PDF document text
    • http://bathforlegs.xyz/kunotugamijevedekenipoddsv.pdfIn PDF document text
    • http://wonder-ita.fun/14373414554y1f5h.pdfIn PDF document text
    • http://bivaxosufuxibo.mygamesonline.org/blumenfeld_clinical_neuroanatomy.pdfIn PDF document text
    • http://hiziryigit.online/gesujafiwijimomvbav.pdfIn PDF document text
    • http://hookup666.site/88703439728iez71.pdfIn PDF document text
    • http://medway24.com/850605315569w1bd.pdfIn PDF document text
    • http://boldly-grow.com/adele_i_heard_that_youve_settled_downzk9cd.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/4995e4b0-8f04-4b81-b4ba-fbf8a3394de1/87116076793.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/vpn_android_gratis_semua_negara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6135b761-2cb7-4fef-95b1-ebf1310390b1/hoover_carpet_cleaner_steamvac.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/17127562075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93c8e1fc-28d1-4e6f-89c9-bebe2b9715a9/battlefield_of_the_mind_joyce_meyer_barnes_and_noble.pdfIn PDF document text
    • http://gegurobaz.myartsonline.com/54154149312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab2adf84-3552-417e-b217-d41a2712d112/34012906885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b6110c8-da6b-49ea-9fbf-a905855c06d0/kotedidewafipuzirolagoza.pdfIn PDF document text
    • http://jafixomedimun.onlinewebshop.net/navy_bmr_study_guide_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/do_you_need_c_to_learn_c.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_off0000ecc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC0 5560 bytes
SHA-256: 30935681c956fadffed5106770bba49aa38c53353b105b33b2b4cb76677d5448
font_01_sfnt_off0000ff99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF99 10584 bytes
SHA-256: 4201967d45354f741a6cce0d55b6d0c837a58808d9fa4168b92b2ac5bf350542

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