Malicious PDF — malware analysis report

Static analysis result for SHA-256 a846fa088f69d54e…

MALICIOUS

PDF

104.8 KB Created: 2021-03-15 17:24:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d13db91a9a0ea4855d8b5050f26f318a SHA-1: 9d2802159f0508bc52472a206c1a6a2ade7161ff SHA-256: a846fa088f69d54ed855e090c349fcd983a619f382088f3129f0efd3fd4384d5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/123?utm_term=liberty+tax+inc+annual+report PDF link annotation
    • http://hihikane.space/podigogazgu5a0.pdfIn PDF document text
    • https://cdn.sqhk.co/nodezaneripe/jhheAeD/ncg_cinema_movies_battle_creek.pdfIn PDF document text
    • http://e-sparks.ru/migusofepoe67tu.pdfIn PDF document text
    • http://goldenframecollision.com/48860934386y1h1h.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/ijAAAhd/34564693878.pdfIn PDF document text
    • https://cdn.sqhk.co/gidowoji/iLUpIib/92425050772.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/ieCtgiV/show_me_funny_pictures_of_dogs_and_cats.pdfIn PDF document text
    • http://copyrightshelpscenters.com/150020859149v0fy.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/asics_cricket_shoes_size_guidewqetb.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/Jghggic/obd2_mini_elm327_bluetooth_interface_adapter.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/filagon.pdfIn PDF document text
    • https://pomulopegodetom.weebly.com/uploads/1/3/1/3/131384256/jojuwezi.pdfIn PDF document text
    • http://nonretloli.site/barbados_immigration_department_passport_formsibus7.pdfIn PDF document text
    • http://reduslimitaly.website/basic_emotions_word_search_answersi2r3b.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/7f1c9485-540e-4ca6-b4ca-c318d4b105e9/the_100_books_by_kass_morgan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/578334cc-edba-4ba9-a938-bb52e0c7e5db/zeganubudupu.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/27168874278.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/texas_dot_hydraulic_design_manual.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_off00015c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C49 5000 bytes
SHA-256: 4f6febccfe9f0985e76cacbf33a4ff22a34602f2e9437a9cad3fd7827dffb73c
font_01_sfnt_off00016d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D6A 12100 bytes
SHA-256: 97bfad976205e954d4d7e46f9cdb48352cd4ce9004e95ca3abde9b7a82a031d1

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