Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0cd7d56045f9d78…

MALICIOUS

PDF

92.6 KB Created: 2021-03-18 23:10:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2695cfafdfd0e1665ecd7fa413dd311f SHA-1: 6ab9590083a18571d5fe61d0accadef46b9d5b8c SHA-256: f0cd7d56045f9d78629811956f462ce5a36a1ba484a129bbebdc300258225497
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to performance appraisals, suggesting a lure to trick users into visiting the malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/123?utm_term=performance+appraisal+methods+advantages+and+disadvantages+pdf PDF link annotation
    • http://mugedly.xyz/zupuvebezogodiwinopiz7wu2b.pdfIn PDF document text
    • http://drnextact.xyz/9909590158kipy1.pdfIn PDF document text
    • http://sodigowusubi.iblogger.org/noun_verb_adjective_exercises.pdfIn PDF document text
    • http://organic100.fun/evidence_of_evolution_worksheet_quizletsx9rb.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/qyghjft/4_facts_about_the_human_body_system.pdfIn PDF document text
    • http://wow50.pro/kelitopakanijokolumurutadiu3rx.pdfIn PDF document text
    • http://watertea.space/mavanejegepobivupesjtap.pdfIn PDF document text
    • http://1xbet-football.fun/bg_voz_informacije_kontaktz8d17.pdfIn PDF document text
    • https://cdn.sqhk.co/sikibeve/hhDgjcV/fruit_shooting_games_download_free.pdfIn PDF document text
    • http://nebo-baikala.ru/does_gamestop_ever_have_coupons984zl.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/8757046321176a9.pdfIn PDF document text
    • http://kieverts.xyz/vugemulejotafs5y0x.pdfIn PDF document text
    • https://cdn.sqhk.co/feziwetesene/jgggfih/wikejadefifejamuvisomuz.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/kuboki/87324333658.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/12652423036.pdfIn PDF document text
    • http://gofirog.epizy.com/sujawu.pdfIn PDF document text
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_c41f77b1bfac454aa821bd7cebf3e9fb.pdf?index=trueIn PDF document text
    • http://sixizezovopir.epizy.com/pilevopijaxulijuvunetoke.pdfIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_2b8cdac3a484494db914a29682d46a77.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/yardman_riding_mower_battery.pdfIn PDF document text
    • http://lixanixuzuki.rf.gd/32012009885.pdfIn PDF document text
    • http://zenadeguposu.rf.gd/literary_criticism_example_sentence.pdfIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_41050f28d9de47f3abf40d464724d510.pdf?index=trueIn PDF document text
    • https://d7d9470a-9784-4c28-ac68-b1ab0f70ddf3.filesusr.com/ugd/148484_23bfb66d525b4dc2948bb0c4e9fa77f2.pdf?index=trueIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_1c65734b8afe47f4bc72efab7eaee945.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_off00012ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE7 5632 bytes
SHA-256: 120c21c1c891d21fcebc219e21e63bc8df46a5bcb4484183fd7da5430f4960b4
font_01_sfnt_off00013fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE2 10788 bytes
SHA-256: 47f89d0d444d0c0420f248aba480aef7a2fbd2d6cd9889f732001fbe065309f8

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