Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc41434dc4ef117…

MALICIOUS

PDF

76.0 KB Created: 2021-03-22 02:13:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2c06dc5fcb37ad384d0d3112f716154e SHA-1: e40b0f6c361ec8920711663195e8d1c3c663d5f1 SHA-256: 0bc41434dc4ef1177585a666deaacbb99c8710bec0b3e00009ce48384bd967b2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it functions as a link farm designed to redirect users to potentially malicious websites. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO spam or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • 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://ponafet.ru/award?keyword=il+cubismo+arte+pdf PDF link annotation
    • http://fofolep.mywebcommunity.org/blockchain_ebook.pdfIn PDF document text
    • https://rasozonikazip.weebly.com/uploads/1/3/4/9/134904665/wozufadenukif_juzimevatisejof_vubarugexafumej_vomenure.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/dmpjdLm/20242221996.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/XDjdidq/battleground_survivor_battle_royale_apk_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/nojebimit/jaxXjjw/bowikolo.pdfIn PDF document text
    • https://cdn.sqhk.co/maduzonuxoke/ghwjbjc/70471607747.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/LowhdLF/17673993321.pdfIn PDF document text
    • https://ruxabetuju.weebly.com/uploads/1/3/2/7/132740595/milibimari_fawufa.pdfIn PDF document text
    • https://rawekawus.weebly.com/uploads/1/3/4/4/134467784/a538809b.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/vjbqgic/furniture_modern_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/gizolaxufo/gjbBge5/instagram_old_version_apkpure.pdfIn PDF document text
    • https://fejiwapofiji.weebly.com/uploads/1/3/4/6/134699364/1344597.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/jc20hbZ/jepera.pdfIn PDF document text
    • https://bonomomu.weebly.com/uploads/1/3/0/7/130775928/2efc404cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bagugexasorip.myartsonline.com/bafg_antrag_bayern.pdfIn PDF document text
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_b27e8b70553a4f728b13801583ab90d4.pdf?index=trueIn PDF document text
    • http://koxolavomuzo.myartsonline.com/lakavobakaxovututer.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_ed8b4c93e2fc4d298c17e7ca43f89e6b.pdf?index=trueIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_36f6210bcefe47429d82a0dfd8fcb4f6.pdf?index=trueIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_192c2d5cf1494f02a0c3358925c0a2fd.pdf?index=trueIn PDF document text
    • http://fuwutowamig.myartsonline.com/comment_apprendre_le_franais_gratuitement_et_parler_le_couramment.pdfIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_c24e0bb7e8f44ceda7f30736b32f1657.pdf?index=trueIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_6c4b1041542141478f05b524ab63c6db.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_off0000ec5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5B 5380 bytes
SHA-256: b061a83634a25b5a34ec83c161898b1a8d5d04614b092ff508fc0c1c9ce0ad99
font_01_sfnt_off0000fe82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE82 11128 bytes
SHA-256: c3a43f8b50a7ea48d5b64d65b1da4f546a2e34bec470d145175874d399c978fd