Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09861ebd5b1e5fe…

MALICIOUS

PDF

85.2 KB Created: 2021-02-25 03:01:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f7545915d002571e188747feb234a145 SHA-1: 20b0d2a2c821c83c844f883f94f470d849f57895 SHA-256: a09861ebd5b1e5fec4a9bddec8e24e8ce6a831a700f981aba91a842fd38f2428
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 0.9998

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/123?utm_term=what+bullets+does+a+ruger+lc9 PDF link annotation
    • http://kurs1.xyz/81005626452mz0q5.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/czW2RKX/fatal_raid_hack_mod_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384307/normal_5fcf297f3206f.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/nanubuka.pdfIn PDF document text
    • https://cdn.sqhk.co/papowepu/5vYr6hg/30646479520.pdfIn PDF document text
    • https://lumodafudewose.weebly.com/uploads/1/3/4/4/134480169/9756815.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/rem_1187_review.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/75658121891.pdfIn PDF document text
    • https://fafetomipisiso.weebly.com/uploads/1/3/4/6/134603542/3660e93.pdfIn PDF document text
    • https://cdn.sqhk.co/feduvefas/fjaHjgE/20151519180.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gafodix.myartsonline.com/sensory_details_examples_touch.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_off00010d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7D 5512 bytes
SHA-256: 4c60652fcfd5f5fc6c7375b34c610f7f5e2b751696b633698f960fde87f04092
font_01_sfnt_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 12292 bytes
SHA-256: 1487923d638f06b8180e0c378b5f99172f192a3e64790f1a8b4339bd8e12617e

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