Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4b7b438c04f9d1…

MALICIOUS

PDF

73.6 KB Created: 2021-04-01 23:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 49c2197bf9819e3b750eb8d347ec8dcb SHA-1: 543728a08c0f2d4949708fccd1b6816cffd1cfab SHA-256: 8d4b7b438c04f9d1e210bdee3e5dfa6c8094fa1b12c00cf381f5457d2d565129
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. This suggests a phishing or scam attempt, likely to redirect users to a malicious site for further exploitation. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://mezovuduw.ru/award?keyword=statistical+quality+control+wiley+pdf PDF link annotation
    • https://cdn.sqhk.co/kirorakoxu/Yjcjbsd/fopubugope.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/companies_acceptance_of_deposits_amendment_rules_2020.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/a_flowering_tree.pdfIn PDF document text
    • http://tejidirexe.mywebcommunity.org/north_america_map_outline.pdfIn PDF document text
    • https://cdn.sqhk.co/joxezexukub/sjd7vij/idle_kingdom_builder_mod_apk.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/d124550d-43bd-494a-a9f3-c170fcbf0e32/21689261742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10a7c6ed-3926-44c7-a2fa-0423cd75e14b/how_do_i_clean_my_new_house_after_construction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0924c89-bd88-49b8-9872-c58d84bdbae6/bezesonasezexuxunuvafewo.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/14926293835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cc1edd8-682c-44d4-887a-11b46edd19cc/59015439058.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc0dd88-c0f4-4e9b-86d8-2e3707f7b2e5/kurexaf.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/veterinary_technician_training_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8d2a356-1f10-4a19-a581-67d59f781a8e/what_trucking_companies_offer_paid_cdl_training.pdfIn PDF document text
    • http://bakakixutuv.myartsonline.com/dofuzozixetefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e44bd4-0046-4778-b45b-bb81078b041b/14999553574.pdfIn PDF document text
    • http://kagijido.myartsonline.com/16197508856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb49b8eb-db80-456d-b9c9-e1c02db2bf09/xodixulalapux.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_off0000e38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38A 5572 bytes
SHA-256: 15998dc0eb55220ae717e1aae9ea0894ad703c26c145b183795d1eb65d7a60c5
font_01_sfnt_off0000f6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 10148 bytes
SHA-256: 9d68422b8fb4cdd9d648a6d6165ea39cb5001a22b68efd3225f764cd42deedbf

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