Malicious PDF — malware analysis report

Static analysis result for SHA-256 83091805527b41b9…

MALICIOUS

PDF

69.7 KB Created: 2021-02-13 19:39:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 74ab678e8ebd111212eaec43c9007218 SHA-1: 50caed29cd48e30e2475fcc2e68865a5e36fa2b6 SHA-256: 83091805527b41b924e01f1ad3e5d155ebc698f62d1ae9fcd4cb7cd69fbccbb9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 trojan. It contains numerous embedded URLs, many pointing to disposable domains, which are indicative of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wix?keyword=proctor+silex+rice+cooker+37533+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461786/normal_5fd199ec923fc.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/axis_bank_iconnect_application_formxlra6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448115/normal_600563ef3f877.pdfIn PDF document text
    • http://netlysy.online/72273274447voppq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450036/normal_5fdc33231b63f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377120/normal_5fe3d916b39a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482638/normal_6024711f4913a.pdfIn PDF document text
    • http://chempion.coffee/teora_del_universo_pulsante5aoj1.pdfIn PDF document text
    • http://tisigetid.iblogger.org/al_qaeda_terrorist_group_information.pdfIn PDF document text
    • http://ufenmac.com/free_download_farkle_dice_games4n33.pdfIn PDF document text
    • http://espaceabone.com/black_desert_online_sea_apk_androidi4ioi.pdfIn PDF document text
    • http://distornyup.site/nostalgia_yanni_piano_sheet_music9s2cp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367914/normal_5ff577ddd2549.pdfIn PDF document text
    • http://poverkavoda.website/34405795087edn4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474739/normal_5ff4e19878755.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414871/normal_5fd06f8dc7160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406463/normal_602615e048b7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://begosene.epizy.com/8540066145.pdfIn PDF document text
    • http://gexovudin.rf.gd/hockey_calgary_score_sheet.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_off0000d041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD041 5444 bytes
SHA-256: a5c293765ed6cafd998859cef42389e92f0f0e54764409b2c4d3462c519e13f7
font_01_sfnt_off0000e2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BB 11272 bytes
SHA-256: e6fb7ad0202a25b55affcd4b1a20ee14ea933004af7b38b898c0d4772e11ab93

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