Malicious PDF — malware analysis report

Static analysis result for SHA-256 8feff05de98f7bae…

MALICIOUS

PDF

71.8 KB Created: 2021-03-25 15:57:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bc783a18e48bedbc94fac5c60360218d SHA-1: 903128a95597ed9543ec504770bf21ba7b675d92 SHA-256: 8feff05de98f7baebd64bd05121dc62a211a7094c7914d61f9be232e717cceb8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://dafemum.ru/123?utm_term=hocus+pocus+movie+trivia+questions+and+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414335/normal_6003346480612.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/gjgggjk/97387371218.pdfIn PDF document text
    • http://buyfastedcircle.xyz/forgotten_memories_alternate_realities_androida7crt.pdfIn PDF document text
    • http://help-copyrighteamservice.com/demazepemosogujetugiumvuu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382771/normal_5fdc6c3cb782c.pdfIn PDF document text
    • http://vvd.bar/88098790481iyzok.pdfIn PDF document text
    • https://lozugukavokukes.weebly.com/uploads/1/3/4/3/134357100/9070041.pdfIn PDF document text
    • http://dovamemowiruz.iblogger.org/baila_morena_songs_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446790/normal_605b69b77f1c1.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/jfhbiEv/38874202792.pdfIn PDF document text
    • https://cdn.sqhk.co/napefabet/3RjghhG/57269851861.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/ejhjbie/driving_in_car_with_covid.pdfIn PDF document text
    • https://cdn.sqhk.co/joxonorapa/ihdN13N/xerit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375076/normal_602782d3a65d4.pdfIn PDF document text
    • http://vezerfa.xyz/atlas_copco_compressor_parts_near_mehfcc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426810/normal_5fe24e6571256.pdfIn PDF document text
    • https://davokirik.weebly.com/uploads/1/3/0/7/130739121/7384474.pdfIn PDF document text
    • http://recepty-dd.info/sinonekedijiwawewojhw4jy.pdfIn PDF document text
    • https://penukigoguni.weebly.com/uploads/1/3/1/6/131606127/mijez-meruxesa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zugosixefi.epizy.com/everyday_use_theme.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/baseboards_for_model_railways.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/guided_reading_level_a_wrinkle_in_time.pdfIn PDF document text
    • http://jedamonemazuj.epizy.com/nutrition_books_for_bodybuilding.pdfIn PDF document text
    • http://kuxogazixup.rf.gd/41813148365.pdfIn PDF document text
    • http://vegefosapol.rf.gd/alta_performance_em_vendas.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/metformin_stada_500.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_off0000d9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 5428 bytes
SHA-256: 0d140c1766d6d192d88a0bce6bd796c891b8bd7a00afc02970c3c58f5adf92f8
font_01_sfnt_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 10796 bytes
SHA-256: db2288df0da403ed5f02d483c84cebaa8a2886eb9d3bef3f5b2ce4534ca65987

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