Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9212aa0cf9e2d0…

MALICIOUS

PDF

75.7 KB Created: 2021-04-04 02:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 02a91dbabc660a57b5c987f125aefbd2 SHA-1: c297b40da30b42c5d717c5e392894f734c216936 SHA-256: 6b9212aa0cf9e2d004abe4c2aea190ac0bd42863ea2a4f3cada5d20519423b1e
126 Risk Score

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 external URIs, with a prominent one being https://seumenha.ru/wix?keyword=gregg+manual+pdf, suggesting a lure to a malicious site. The document body, though heavily obfuscated, contains references to "Gregg manual pdf" and the wkhtmltopdf application, indicating it's likely a crafted document designed to appear as a legitimate search result or download. No scripts were extracted, but the presence of multiple disposable domains and link farm heuristics points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/wix?keyword=gregg+manual+pdf PDF link annotation
    • http://dajobod.getenjoyment.net/automate_programmable_industriel_siemens.pdfIn PDF document text
    • http://fezelegafefuv.mywebcommunity.org/muwirosikakijuzifet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465263/normal_5fdc6502b2084.pdfIn PDF document text
    • http://vavazexowupex.medianewsonline.com/suxuteluvosu.pdfIn PDF document text
    • http://piwofoterif.sportsontheweb.net/mudupesaxulatope.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/sokalu_wagak_lurarilifano.pdfIn PDF document text
    • http://ruvogodozipabiv.scienceontheweb.net/25133826437.pdfIn PDF document text
    • http://volelovapudexif.scienceontheweb.net/brigid_kemmerer_letters_to_the_lost.pdfIn PDF document text
    • http://jarevine.mywebcommunity.org/exercice_algorithme_fonction_et_procedure_corrig.pdfIn PDF document text
    • https://xununurolaweb.weebly.com/uploads/1/3/4/6/134673503/budanifeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418755/normal_5fe3492be2392.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/aaa_auto_insurance_policy.pdfIn PDF document text
    • http://kumajamefe.getenjoyment.net/reflejos_de_automatismo_medular.pdfIn PDF document text
    • http://kepuxom.mypressonline.com/teacher_appreciation_letter_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366666/normal_600dc44d6b499.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taguminuligifis.rf.gd/turn_webpage_into_chrome.pdfIn PDF document text
    • http://jufogitomob.onlinewebshop.net/bncc_ensino_fundamental_em.pdfIn PDF document text
    • http://fikelamizogu.myartsonline.com/72498543150.pdfIn PDF document text
    • http://futebowa.atwebpages.com/18502744862.pdfIn PDF document text
    • http://gisumizubusev.rf.gd/what_foods_do_you_need_to_avoid_on_a_gluten_free_diet.pdfIn PDF document text
    • http://gapoxuvopa.onlinewebshop.net/zisakisomoxagaw.pdfIn PDF document text
    • http://xemunebo.atwebpages.com/tipos_de_anemia_falciforme.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_off0000eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 5216 bytes
SHA-256: b7db688e006747b79c15b6ddfca037ce16dc8e928b3d4e559391f2295d36d918
font_01_sfnt_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 10768 bytes
SHA-256: ee1ae53f136bbd31c6036964d3dc2ee76df432013fd5ee043fa5c7b75d92b3bd

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