Malicious PDF — malware analysis report

Static analysis result for SHA-256 87cff3f95c087264…

MALICIOUS

PDF

67.0 KB Created: 2021-03-14 22:08:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b69bd34e2ffd207ba85794c4a772e86f SHA-1: c9022b4cd638de53ada0770d8d6ebd3df3bd6322 SHA-256: 87cff3f95c0872644abdc7ea05b7114fcb105a1a2cd12038490002467a17a22f
126 Risk Score

Malware Insights

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

The PDF sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure and URL distribution point towards 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://vilenefex.ru/123?utm_term=change+background+color+android+app PDF link annotation
    • http://thedefenseforge.com/kexepa5cxth.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412158/normal_6002d05ea9329.pdfIn PDF document text
    • http://wonnaturila.space/dota_2_guide_indonesia_slardarkk51y.pdfIn PDF document text
    • http://meetlait.pro/clothes_dryer_consumer_reports_best_buyd38ag.pdfIn PDF document text
    • http://trylait.club/simibeditiguzobumibonudah0nrf.pdfIn PDF document text
    • http://inglassrus.ru/parmenides_theory_of_realitybp8jy.pdfIn PDF document text
    • http://beststudent.space/9992743636gfldf.pdfIn PDF document text
    • http://websecurer.tech/buddy_toss_hack_iosv6u9v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406787/normal_600c453d0e48c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449614/normal_603a440da076a.pdfIn PDF document text
    • http://copyright-infringement.business/do_you_get_white_hairs_from_stress3dfov.pdfIn PDF document text
    • http://portkamesto.site/diwotigirazuzezubalugeusidk.pdfIn PDF document text
    • http://cheapestshop.xyz/18358123132gdgrf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_865f10ddfa244e3da00012c11d5e862f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/71038681643.pdfIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_2bab57c74c9b43a5b8c28e16b60cbf56.pdf?index=trueIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_617b96b7219e4c18bb0ddaa91ae68ed1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/ascential_plc_annual_report_2019.pdfIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_6cbf81657ce34c7daa017e9929edc465.pdf?index=trueIn 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_off0000cbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEF 5264 bytes
SHA-256: c508773c6ececc41f76a3a1f9ede2fad5ea78e2e0982ba36dee38b8f682c0533
font_01_sfnt_off0000ddc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC7 9600 bytes
SHA-256: 2986e1f083d7a6e4a16f796ad8d38a4644a994440187726b23e9396bd93d688f

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