Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3669ae4318f185…

MALICIOUS

PDF

72.9 KB Created: 2021-02-26 20:25:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f2433d0bb51433ff913108b3e7498e88 SHA-1: cede9fb7ebec2f154ad57ded394f537259558338 SHA-256: 8f3669ae4318f18572a196e2f9bb2c7fc6322819369a86b2da527616ef0637f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jumiwimov.ru/123?utm_term=best+chronological+bible+reading+plan+pdf PDF link annotation
    • https://fekamudubop.weebly.com/uploads/1/3/5/3/135325245/lovoxepupufuzokaz.pdfIn PDF document text
    • http://insta-sale.site/abcd_1_full_movie_in_hindi_free_downloadatkjh.pdfIn PDF document text
    • http://e-sparks.ru/285937039768ja5d.pdfIn PDF document text
    • http://how2clever.com/54972541117nhzl7.pdfIn PDF document text
    • https://kesadoxiluxar.weebly.com/uploads/1/3/5/9/135974677/xebegonap-noxonulazigo-wopuwofuni.pdfIn PDF document text
    • https://nepokotivo.weebly.com/uploads/1/3/2/8/132814168/gixirit_bimezusekagamid.pdfIn PDF document text
    • https://noxiwojudom.weebly.com/uploads/1/3/4/7/134723323/dipiloxoxopob_gozos.pdfIn PDF document text
    • http://vevemogijip.22web.org/sound_recorder_android_one.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/buxuzupimirobufuzazipamit.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/eDV7gcv/werewolf_cat_cost.pdfIn PDF document text
    • http://proba7.xyz/top_fantasy_football_picks_cheat_sheetafek1.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/city_of_thieves_book_amazon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lofese/cribriform_carcinoma_breast_cancer.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/18322138279.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/brownies_uniform_shop_guildford.pdfIn PDF document text
    • http://goruloloxoz.rf.gd/xazunodojodibav.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_off0000df85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 5604 bytes
SHA-256: bbcec7ba1beaf851698b12191a9e9e3b8d832865918f7a9504217d3df9f7bb72
font_01_sfnt_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 10468 bytes
SHA-256: 7a6ec23139c3696cfe2af6302e94d7c7a3e7f0b65c8fcf0eb36dad321a22b742

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