Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a91989ea8fd749…

MALICIOUS

PDF

84.1 KB Created: 2021-04-09 10:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 466d64452316e9548ca39a599dc1e20e SHA-1: dc8693bc0c7d510d951c39a24cecfae75fbe7467 SHA-256: 36a91989ea8fd74911e4c497f01f63d2f45c40783a72be5bb361c77cc5752661
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://xajibur.ru/strik?utm_term=python+programming+pdf+2019 PDF link annotation
    • http://gojoges.iblogger.org/mercedes_benz_s_class_2020_brochure.pdfIn PDF document text
    • http://weridif.medianewsonline.com/40489802932.pdfIn PDF document text
    • http://gratoram.site/shimano_ultegra_di2_r8050_front_derailleury9txm.pdfIn PDF document text
    • http://mavixepajifulem.scienceontheweb.net/nerufosimomumi.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/spt_portable_air_conditioner_wa-8070e_manual.pdfIn PDF document text
    • http://karejis.iblogger.org/77558390167.pdfIn PDF document text
    • http://golipodib.22web.org/acmarket_apk_app_for_android.pdfIn PDF document text
    • http://sapazukuwujoji.22web.org/wikafenaxefamud.pdfIn PDF document text
    • http://ductsunlimitedins.com/liselijerenitenitupu5li.pdfIn PDF document text
    • http://pefasogep.22web.org/30364655288.pdfIn PDF document text
    • http://znatural.space/favigarewumevokarimobx1t49.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_e50358d19d494354ac8cc8509762948a.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_c1f85e11463943c5ab87daad5704f2f6.pdf?index=trueIn PDF document text
    • http://nowimirozox.atwebpages.com/list_of_poisons_and_their_antidotes.pdfIn PDF document text
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_ce2a815bd7f747bc8d58f3e171f9ec32.pdf?index=trueIn PDF document text
    • http://kozolamo.rf.gd/35068982325.pdfIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_82210492597c48a3901bd4d1ff28c463.pdf?index=trueIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_238ed3da421b403f8bb0f240e7e0e192.pdf?index=trueIn PDF document text
    • http://molodetagako.epizy.com/95011955976.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_off0001072a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 5828 bytes
SHA-256: 76cc50de77f5a99e1fd5dd55eb834dc0e9eb3e04d54ccda3a95fec1141a5920b
font_01_sfnt_off00011aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEE 11876 bytes
SHA-256: 8e8c2f78314739f143cf7214c18c246a7115a6722e85942d07a9fcc0280f67ec

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