Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8f38b4797873d1…

MALICIOUS

PDF

73.7 KB Created: 2021-04-04 07:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9729c6667022a7e7027d627f61c892f9 SHA-1: 9e3f84ba97c0992ccc35c757f9e79e4d40dcbebe SHA-256: 8f8f38b4797873d1a6c81e7ddce16eaf739fa96906d83dcd1ae0105c657b352b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to direct users to potentially malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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/strik?utm_term=brother+hl-2280dw+replace+drum+reset
    • http://reduslim-italiaufficiale.site/que_enfermedad_provoca_comezon_en_el_cuerpo13g37.pdf
    • https://cdn.sqhk.co/xojelumegasi/gd7gehe/best_hollywood_ringtones_free_download_mp3.pdf
    • https://cdn.sqhk.co/zebenane/gizjdhc/super_pads_become_a_dj.pdf
    • https://cdn-cms.f-static.net/uploads/4376359/normal_604aaecd9ddbf.pdf
    • http://podarokinsta365.site/how_to_calculate_heat_loadex5ux.pdf
    • https://cdn.sqhk.co/xetilibul/Thfe4Nq/treasure_hunters_book_1_cliff_notes.pdf
    • https://cdn-cms.f-static.net/uploads/4448991/normal_603e544b8e0eb.pdf
    • http://show-visitor.xyz/lewijojamelekosov96dd.pdf
    • https://cdn-cms.f-static.net/uploads/4392193/normal_6061d04fd69a4.pdf
    • http://lnstagramcopyrightcenter.com/batman_death_in_the_family_online_subtitulada8hw4d.pdf
    • https://cdn-cms.f-static.net/uploads/4401711/normal_6050047883051.pdf
    • https://static.s123-cdn-static.com/uploads/4379370/normal_5fc79dc976730.pdf
    • https://cdn-cms.f-static.net/uploads/4450041/normal_5fd136aa2115d.pdf
    • https://cdn-cms.f-static.net/uploads/4382421/normal_602d70fee80c9.pdf
    • https://static.s123-cdn-static.com/uploads/4381344/normal_5fff93ae0d9ae.pdf
    • http://qwertyujg.xyz/vejufejaanu7t.pdf
    • http://smm-target.ru/mabexegalotofuwagezipiluxc52jd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_298b5027c5d84ffcb13284c37640a40b.pdf?index=true
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_52cf75e7384442b68119aa7dd52f75fd.pdf?index=true
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_d32b91b0bb2f4a07837417c2fd75871c.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de8e.bin
73867ec3fa025dee1db93025d42514f65e9ac4bdd261a3462067ce93b755f2ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8E 5956 bytes
font_01_sfnt_off0000f2bd.bin
81394df45a4d00d3b6715fb05e0c1bf87193e238e16fdea57035a179346a8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 12036 bytes

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