Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5244d8d730a1cb…

MALICIOUS

PDF

73.4 KB Created: 2021-02-28 07:42:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 89eaec78af07855325da6db3cacb8d7a SHA-1: 0b04a0c6318116edd12b6e986ab92d5ecc2fb678 SHA-256: 7a5244d8d730a1cbd071d2349a158101e335d0fffb7b7156e5be250fb19d32aa
126 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://soxebez.ru/strik?utm_term=primetime+adventures+review', are likely used to redirect users to phishing or malware download sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing or malware distribution campaign.

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://soxebez.ru/strik?utm_term=primetime+adventures+review PDF link annotation
    • http://xevusezes.medianewsonline.com/nipisaripavugudokaveb.pdfIn PDF document text
    • http://useporte.xyz/autodesk_360_free_for_windows_10ii6kz.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/icifgcN/pobujupovarezaz.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/twilight_2008_full_movie_in_hindi_part_1_download_720p.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/hfSWPje/bingo_song_download_djpunjab.pdfIn PDF document text
    • http://avbox.org/52474259933vk8gn.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/solilonisodozomijon.pdfIn PDF document text
    • http://successinyourlif.website/bobcat_e45_service_manual5bgxo.pdfIn PDF document text
    • http://derobidav.iblogger.org/35671478423.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rozibata.epizy.com/vinudeguv.pdfIn PDF document text
    • http://wibenuke.epizy.com/soviet_march_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/dajapaloxokumixa.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/html_css_templates_free_download_responsive.pdfIn PDF document text
    • http://bavatesivo.myartsonline.com/honda_gcv160_parts.pdfIn PDF document text
    • http://duziroro.myartsonline.com/39406020398.pdfIn PDF document text
    • http://febiked.rf.gd/lezorasefigepazuxonuze.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_off0000e4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 5092 bytes
SHA-256: 2b1f8150b7fca3e79daa99f6cd7cb2d05231207173c9c10ab3f9c6b9649578e5
font_01_sfnt_off0000f5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E8 10108 bytes
SHA-256: 03b4ec0bf4b073ba210c9fe44b4785437caf7253f670e33a2e3f55c11bb50566

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