Malicious PDF — malware analysis report

Static analysis result for SHA-256 0208416195d33fa9…

MALICIOUS

PDF

76.6 KB Created: 2021-05-09 02:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4c4d839150643035e4552158da22126 SHA-1: 52a531f1f3755255403d21984bef5c4ccbb0e95a SHA-256: 0208416195d33fa936809735001de94cf9b8b92b6a7fd7fabd57105f44254cb7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, identified as a link farm, with many pointing to disposable domains. This suggests a phishing or malware distribution attempt, likely using spearphishing as an initial access vector. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=bosch+800+series+dishwasher+shvm88z73n
    • http://4escam-bot.online/mefov4crd3.pdf
    • https://ninijaliwejito.weebly.com/uploads/1/3/4/3/134350726/kajomuxupivo_vepekugisuka.pdf
    • http://otomail.business/xekuxasuje3l9.pdf
    • http://femalawiterig.iblogger.org/federal_deposition_objections_cheat_sheet.pdf
    • https://zitewamim.weebly.com/uploads/1/3/1/4/131454986/wuxezijeta.pdf
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/1511955.pdf
    • https://gunapozebufe.weebly.com/uploads/1/3/4/3/134316646/7634969.pdf
    • https://zetodimamewiwek.weebly.com/uploads/1/3/2/3/132302859/c44cff.pdf
    • https://ronukeva.weebly.com/uploads/1/3/5/3/135385202/7532806.pdf
    • https://vafunaparixidi.weebly.com/uploads/1/3/4/6/134627598/salirokani.pdf
    • http://vuxetexab.22web.org/premiere_pro_templates_folder.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gaxosinuda.rf.gd/what_does_the_american_constitution_say_about_voting.pdf
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_d8d7579289eb4f848b5bd4933c82a0c9.pdf?index=true
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_15969d4fd68246d9b892bee4d22255c7.pdf?index=true
    • https://s3.amazonaws.com/fosagoba/emiway_bantai_khatam_mp4_song.pdf
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_a0f755b958b74e558913e2650d3a144b.pdf?index=true
    • https://s3.amazonaws.com/xopugup/balloon_counting_worksheet.pdf
    • http://degivenumi.epizy.com/kitchenaid_gas_stove_griddle.pdf
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_60e43099696f43f59e6ffcefd01f2b42.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_off0000e981.bin
e50565475e0522a71b193100fe5fd50a641b2b07a1fbabd686c66512eca50e2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 5980 bytes
font_01_sfnt_off0000fdd9.bin
52447434ccaa57fd700a212511bb364fbc7eee7a5d24e41f6193d9cd46d6f71a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 11232 bytes

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