Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5c91fc909ad08e…

MALICIOUS

PDF

84.2 KB Created: 2021-03-17 13:30:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9699c393666f7ebf89d579fa9d169d38 SHA-1: b55551aa72d2a1c1e0c7e94380116c4b1f111fd2 SHA-256: da5c91fc909ad08e1903a0645508c378cc59c9a676d1a0fdd60304c0717e28ad
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

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=smoke+hollow+26142e+26-inch+electric+smoker+manual PDF link annotation
    • http://nojolavu.22web.org/calcutta_university_migration_certificate_application_form.pdfIn PDF document text
    • http://razvivatel.blog/bandeya_song_mr_jattx36ts.pdfIn PDF document text
    • http://eglo.club/marshall_mg30cfx_price_philippinesu1ur2.pdfIn PDF document text
    • http://sosuziba.mypressonline.com/89141259116.pdfIn PDF document text
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/vewiduduzu-litus-gizomobunudena.pdfIn PDF document text
    • http://sesizuxewewax.mygamesonline.org/unir_varios_en_uno_adobe_reader.pdfIn PDF document text
    • https://xepinepuro.weebly.com/uploads/1/3/0/9/130969238/8093374.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/17344865117.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/pisinefaworizopepoga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_60225bc6bad0a.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/will_you_come_and_follow_me_song_lyrics.pdfIn PDF document text
    • http://waralolojogeta.sportsontheweb.net/69184082706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367941/normal_6017beb72970e.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/traxxas_stampede_2wd_brushless_system.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383577/normal_5fe5324ac9b0f.pdfIn PDF document text
    • http://wunegufope.iblogger.org/lobexapiwizav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://javasuk.epizy.com/bcbs_appeal_form_ny.pdfIn PDF document text
    • http://zonafikepejese.onlinewebshop.net/mapa_provincia_albacete.pdfIn PDF document text
    • http://pilejifizodan.onlinewebshop.net/mekuraxixisixinaf.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 5756 bytes
SHA-256: f695630068287bdaaed8b3eeb67154047744e6aff158b96c0e9d942f471fd3ff
font_01_sfnt_off00011936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11936 12060 bytes
SHA-256: 9439951843267f8906f57b3c6786585c7f92068068f6cf56f4aa0103c4e71d2c

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