Malicious PDF — malware analysis report

Static analysis result for SHA-256 c147782445910f2d…

MALICIOUS

PDF

80.0 KB Created: 2021-06-10 11:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c43cbc91ee9b1bde1cc58830083241ca SHA-1: cfd2855b95b24fcca679dc18bb499e4f9a98ba9b SHA-256: c147782445910f2d1afce7a2b82ef4d7bec679b5a521fec0abf08f6a41e0dde8
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pixomot.ru/pbw?utm_term=hello+neighbor+alpha+1+para+android
    • https://nugaruxiboxora.weebly.com/uploads/1/3/0/7/130738781/mudubox-liritilevowesej.pdf
    • https://tizidebiwefixim.weebly.com/uploads/1/3/0/7/130739379/2237857.pdf
    • https://tisitijalazog.weebly.com/uploads/1/3/6/0/136017937/a11ea67e.pdf
    • https://kakulekatorud.weebly.com/uploads/1/3/4/6/134681497/wibutiwugoganigekuwi.pdf
    • https://zokemubolito.weebly.com/uploads/1/3/4/8/134895641/tisobem.pdf
    • https://kuxanumukamizat.weebly.com/uploads/1/3/4/4/134489101/ronitiju.pdf
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/keketojuzi.pdf
    • https://wuwonemuv.weebly.com/uploads/1/3/4/5/134589345/porisun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://jetubabup.pbworks.com/f/31828878475.pdf
    • https://uploads.strikinglycdn.com/files/30f9fd23-e16c-487a-b9a4-22655926eae6/najixubezexezolasunako.pdf
    • http://gitixofipoxu.pbworks.com/w/file/fetch/144538095/56464664737.pdf
    • http://jobagej.pbworks.com/f/8344438896.pdf
    • http://pebolokunaz.pbworks.com/w/file/fetch/144616275/piebald_dachshund_puppies_for_sale_california.pdf
    • http://zelovoguvunu.pbworks.com/f/arc_length_area_of_sector_worksheet.pdf
    • http://paditoxef.pbworks.com/f/assetto_corsa_f1_2019_mod_download.pdf
    • https://uploads.strikinglycdn.com/files/13871ee7-705d-419c-b939-169e486de02a/sanyo_pro_xtrax_multimedia_projector_service_manual.pdf
    • https://uploads.strikinglycdn.com/files/77c8cd5a-6c82-4b96-8999-abd331c0317c/how_to_calibrate_taylor_scale.pdf
    • https://uploads.strikinglycdn.com/files/bd89a8a7-6675-4a23-b7d8-cdaf3972aaca/how_to_get_more_damage_in_hypixel_skyblock.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d6.bin
4015d2ce7d2bf942bc374238e5afb85484245f04b15d9bae1f57e7bd774cab67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 4904 bytes
font_01_sfnt_off0000f665.bin
b03c5d66767128accb8b16d42e9da35dd209ea4ea4e8655943976d2f8fe4fefb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 19904 bytes
font_02_sfnt_off0001244b.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1244B 4324 bytes

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