Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6e5ad8bf546f54…

MALICIOUS

PDF

72.6 KB Created: 2021-01-18 17:16:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2a950321001525c1cf9bbaef30aba262 SHA-1: b27ff8b8aac9ec3a24c018add5737e4f1e3f8e75 SHA-256: bc6e5ad8bf546f54d6a63bbbe6bcd83254a39169e73843335454c56d5acd6376
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains, forming a link farm. One heuristic specifically flags it as a 'PDF_SEO_DISPOSABLE_LINK_FARM', indicating a likely phishing or malware distribution scheme. The presence of external URIs suggests the PDF's primary function is to redirect the user to other malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/aws?utm_term=sample+letter+of+request+template PDF link annotation
    • http://velavedi.iblogger.org/94277053127.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_5f96bd11e4687.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/himjhgh/blaze_monster_truck.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379603/normal_5fc87d7072d10.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/iibijCt/nefovitewakuvudajeberani.pdfIn PDF document text
    • https://cdn.sqhk.co/bidelefo/hifSHhg/best_free_music_player_for_iphone_6.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonotiso/1jhfhcm/gif_live_wallpaper_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvurero/xjbjjhj/at_t_mobile_transfer_app_text_messages.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f871f1e2e0ae.pdfIn PDF document text
    • http://lupaper.22web.org/accelerated_reader_answers_for_matilda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478146/normal_5fc4a778e7889.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417531/normal_5fa983a40409b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bekapoza.epizy.com/rodomuvafofonewiwiw.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/wakek.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/fistula_foundation_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/old_landline_phone_ringtone_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/malformation_de_la_charnire_cervico-_occipitale.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/pezemuliporurafidu.pdfIn PDF document text
    • http://fuvovidesom.epizy.com/73798835736.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/ginutigojezikigoberudab.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/project_closeout_report_meaning.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_off0000e0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 5276 bytes
SHA-256: c340feaca3ff01abb41864e4f2a0d81ced960ffa7e1cca8d03a247960e7bd0d4
font_01_sfnt_off0000f28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28F 10172 bytes
SHA-256: fcddfa1f6d4203d56cfb21a71418a7273d7b500dde49c29c43621333e3e6bbb1

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