Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbac4febcc6de352…

MALICIOUS

PDF

79.8 KB Created: 2021-04-30 09:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bc8f5dff412e068938410656ba04225b SHA-1: e73c2d20f88a28668ade27fed764b6048bf799bb SHA-256: fbac4febcc6de3529caaf8c2f6b4ee5087d88303b65ec79a045df2d0d23f6c89
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. 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 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=baby+cache+manhattan+crib+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454995/normal_60612e10a1862.pdfIn PDF document text
    • http://rubyshup.space/aldershot_weather_reportooja1.pdfIn PDF document text
    • http://idealica-co.site/pibosijumonopghhse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_5fd8cb173a9fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476445/normal_5fe4e12340a7f.pdfIn PDF document text
    • http://fenejewok.22web.org/what_does_it_mean_to_put_on_the_full_armour_of_god.pdfIn PDF document text
    • http://jowuguzipupuv.iblogger.org/lafepibeneroziwug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496580/normal_6024689723388.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446494/normal_605ffed9f21a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_600f1b6090118.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://datojotimesa.epizy.com/bronkiektasis_referat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df06eaf4-120b-4dfc-ad6d-d0b38466995e/88222475946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a2c18e7-68bb-48a6-843d-2f0eccaadf4c/pedojujipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d0914ef-b0d0-4a29-9298-92051a22978f/words_of_wisdom_for_new_mum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbc67d76-2d9e-4987-8aa6-d01f14aad213/stone_soup_story.pdfIn PDF document text
    • http://wozaxanakix.epizy.com/erbe_vio_300s_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bc9d7b5-cb58-4ec0-b28e-7e98bd670b11/sarafup.pdfIn PDF document text
    • http://juzujodajemafa.rf.gd/wapuxe.pdfIn PDF document text
    • http://pewozemiludex.rf.gd/fonixufifojiruge.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_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 5300 bytes
SHA-256: d3baf1836772eee0160fbda3a05843970a1d5f92038081a0e55909685fba1473
font_01_sfnt_off000107f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F0 11852 bytes
SHA-256: a172b7f58a90e6d546fe9839cb70faf42b7aeb61b49a09f64d4911779287601b

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