Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39f776190bf9775…

MALICIOUS

PDF

90.7 KB Created: 2021-03-01 00:58:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4dd7fcc0ae358a1eaedec047d54a9fab SHA-1: 79e37ed613c206f4f6cb61a5523c42c6f357c03e SHA-256: a39f776190bf97758ca4ef1c2d2f8c66d4f587ba0102a4382f3edfc06bf6c381
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://mezovuduw.ru/aws?utm_term=what+is+computer+hardware+tools PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382960/normal_5fdae2f808bea.pdfIn PDF document text
    • http://unonatur.space/fitbit_inspire_2_clipmu2bj.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/is_there_a_mortal_engines_2.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/14492093712.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458150/normal_5ff8094f7543f.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/raleridex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530990/normal_6009e31a20b03.pdfIn PDF document text
    • http://xenalebosob.scienceontheweb.net/36465131341.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/74449140213.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/college_womens_soccer_strength_and_conditioning_program.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://remigesej.epizy.com/pisazajevimafelokaroremi.pdfIn PDF document text
    • http://fobukisa.rf.gd/bunotokazenixizikufet.pdfIn PDF document text
    • http://voxotili.epizy.com/39057247532.pdfIn PDF document text
    • http://xurosuforudev.atwebpages.com/how_many_hours_does_it_take_to_fall_into_a_deep_sleep.pdfIn PDF document text
    • http://kipenul.epizy.com/usb_borescope_android_app.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 5196 bytes
SHA-256: f73e8c22a1ab2259d396405a9fdc1fe368f852dfbadfaf48bdb92da8a7ba8efb
font_01_sfnt_off00012aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAB 10724 bytes
SHA-256: a6e7b04754e8dcc1390fc94872ece6de4670581cca4d93bb300107a69699be73
font_02_sfnt_off00014f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F4B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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