Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3734b4d8c58d96a…

MALICIOUS

PDF

79.0 KB Created: 2021-03-14 18:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2b81fe79b3806ebf53f5c29ae589004a SHA-1: b5ac48ce239ad17b47343d410384976cd61d9496 SHA-256: d3734b4d8c58d96a132dfb94fe78b838008307954428e2ff4cb80eb39b3160c3
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. A high-severity heuristic identified an image lure linking to an SEO redirector, specifically `https://fokemale.ru/strik?utm_term=does+internet+get+capitalized`, which is likely used for phishing or malware distribution. No scripts were extracted, but the PDF structure and heuristics strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://fokemale.ru/strik?utm_term=does+internet+get+capitalized PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366622/normal_603f6a9b85ff9.pdfIn PDF document text
    • http://lipuwisapi.mywebcommunity.org/alcohols_chemistry.pdfIn PDF document text
    • http://sugoxebojun.getenjoyment.net/wuviz.pdfIn PDF document text
    • http://gogemupiru.22web.org/defozo.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/76150862535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481058/normal_6011625abd5ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_601bb75bba351.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492286/normal_5ffc00ca23aa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384645/normal_5fea31e26b5b5.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/fovezewi/boxobegodariwozosevuvik.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/bandori_event_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/chickweed_planting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/retiburivufexexuwaxu.pdfIn PDF document text
    • http://pugupokevimukov.epizy.com/how_to_open_samsung_ice_maker_door.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/brocade_switch_commands.pdfIn PDF document text
    • http://safagapoz.rf.gd/muzudejefanalovadujipulol.pdfIn PDF document text
    • http://vizawog.epizy.com/81344350536.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/4542166680.pdfIn PDF document text
    • http://wulimazef.epizy.com/ben_10_games_free_for_pc.pdfIn PDF document text
    • http://tezipibuboxigo.epizy.com/wepaxafedozezilagedi.pdfIn PDF document text
    • http://kelawezup.rf.gd/37276375706.pdfIn PDF document text
    • http://goguvero.epizy.com/garmin_vivofit_jr_3_waterproof_swimming.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/dragonvale_singularity_dragon_breeding_guide.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_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 5288 bytes
SHA-256: 543225c33886f5d16cf117b2f8a167cf3469ea40c30ca15daadca2508ace4294
font_01_sfnt_off00010984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 10844 bytes
SHA-256: 39dbaf8024ec1382c456fc8feb4969aecdd2cf87b28c927759cfc7bb7fb36f11

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