Malicious PDF — malware analysis report

Static analysis result for SHA-256 a100a28a2420f621…

MALICIOUS

PDF

86.1 KB Created: 2021-01-24 18:40:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 620fc145f6649a35a048f3df685f4437 SHA-1: 2b66965bb00995a6c0d73e39d1f62d5b89fd5445 SHA-256: a100a28a2420f6217cfa7495e3b9e2caa2d7a2f240538041f75e4e322fb0ccd5
126 Risk Score

Malware Insights

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

The sample was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded URIs indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=z-5500+vs+z906 PDF link annotation
    • http://sqrab.top/stack_cubes_gamea3unf.pdfIn PDF document text
    • https://rarifipive.weebly.com/uploads/1/3/4/1/134131304/f437f42a5b9.pdfIn PDF document text
    • http://hookup666.site/wifi_software_download_for_laptopvigs3.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/i6jhhba/85796434506.pdfIn PDF document text
    • http://money-team.site/265518820623c7qu.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/0jjiawZ/tic_tac_toe_family_game_in_c.pdfIn PDF document text
    • http://dujekuba.22web.org/27478631914.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/hcic25F/devobikakelesap.pdfIn PDF document text
    • http://tcerkovniekupola.space/gupuwaottig.pdfIn PDF document text
    • http://nufapivevavenak.22web.org/color_blindness_test_book_free.pdfIn PDF document text
    • https://sutiwipuxepol.weebly.com/uploads/1/3/4/5/134517417/risejusak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dufuvebali.rf.gd/voxejupefokezuvemowaliko.pdfIn PDF document text
    • http://vowaderisosalel.epizy.com/miruganoribazorebumit.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_off00010738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 5016 bytes
SHA-256: 2dcdf6355a58852368542e84313a7769cf504f6761d7a7773ab55008d1ee073e
font_01_sfnt_off00011876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11876 16084 bytes
SHA-256: c2120696cf8828f72903bf6bedc6dd6ad2787c0faf4f7eb77600eaec399859ee

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