Malicious PDF — malware analysis report

Static analysis result for SHA-256 5154a8cd4545f540…

MALICIOUS

PDF

73.5 KB Created: 2021-04-14 06:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a0f465214629d433c76c9174d29c0726 SHA-1: 255001bc6e9fcf7c9e5e52a22262227d299c0e66 SHA-256: 5154a8cd4545f540ed95bc75bcaefa82072f1b3f95e560e2e8c820642c97b6fd
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to lure users to external resources, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=toastmaster+bread+machine+recipes+1195 PDF link annotation
    • https://legoxadev.weebly.com/uploads/1/3/2/3/132302888/kitudunazelim.pdfIn PDF document text
    • http://jobware.pro/how_network_marketing_companies_make_moneyhs8ny.pdfIn PDF document text
    • http://white-x.fun/magic_chef_wine_cooler_mcbc58dst_manualbjiis.pdfIn PDF document text
    • https://bexudedumazises.weebly.com/uploads/1/3/1/4/131406785/kalisirosof-vireg.pdfIn PDF document text
    • http://cardioactiveitalia.site/797658390310ski5.pdfIn PDF document text
    • https://suranekiwexem.weebly.com/uploads/1/3/4/6/134698667/zukisebev.pdfIn PDF document text
    • https://bunoworerut.weebly.com/uploads/1/3/1/4/131438217/tudek.pdfIn PDF document text
    • https://cdn.sqhk.co/lewatesudo/9hcggiK/ark_survival_evolved_crystal_isles_artifacts.pdfIn PDF document text
    • https://zupikadi.weebly.com/uploads/1/3/4/6/134667234/2196313.pdfIn PDF document text
    • https://sidusumidiwef.weebly.com/uploads/1/3/4/3/134366372/dogigejunofeke-wafax-tukojilugaf-xorosuxe.pdfIn PDF document text
    • http://medicalpracticementor.com/714044429822lfvh.pdfIn PDF document text
    • https://lolorude.weebly.com/uploads/1/3/0/7/130775760/8e4f4c.pdfIn PDF document text
    • https://jovuwimuj.weebly.com/uploads/1/3/0/9/130969820/0322c62cf.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/ghjgjah/hey_clay_birds_app.pdfIn PDF document text
    • https://mirinojasuri.weebly.com/uploads/1/3/4/5/134588432/1038758.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_c698088e5d8248a6b9f77d8494029727.pdf?index=trueIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_3f340b1734794c20be7d8df57de25873.pdf?index=trueIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_421094aa653941b9b9d0c7940d81bc83.pdf?index=trueIn PDF document text
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_375313ccfa8b4d1c9b3a130b4a1e4e03.pdf?index=trueIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_7ef5eee4ae044e6eaf95d0be1ac88d65.pdf?index=trueIn PDF document text
    • https://0a3880f2-9bda-4900-b484-73a003b8a878.filesusr.com/ugd/3cbe5d_7b00a916709743988b101013fc045b54.pdf?index=trueIn 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_off0000e16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16F 5704 bytes
SHA-256: e10e198bfc913a6cfe444ddb20fdf1c4102776771110a1c6773a740fc4d1d200
font_01_sfnt_off0000f4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 10576 bytes
SHA-256: cc4054c8c45daaba5c2f0accc93a7bfbdc69ad88dbae4bc2215d7a1d4f170c15