Malicious PDF — malware analysis report

Static analysis result for SHA-256 4080f47ccd40d5e3…

MALICIOUS

PDF

68.1 KB Created: 2021-02-24 16:48:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2956058158c4172f44b27c44586c2093 SHA-1: 9557d6ae2c1b52b2f77ae77c4d723321bea753bb SHA-256: 4080f47ccd40d5e3df74f9dc4e925788cbb63119be53ea36a3cd2c2eddc93c3e
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious redirection tactics.

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://druttle.ru/strik?utm_term=elementary+linear+algebra+9th+edition+solutions+slader PDF link annotation
    • https://cdn.sqhk.co/bapulofuw/t4jftq1/duck_hunting_game_online_download.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/zedakakuzavofesobufibufa.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/TvjigiA/flying_dragon_hunting_dragons_shooter_game_2020_download.pdfIn PDF document text
    • http://zazonowipudu.66ghz.com/naresakomakopumufixoma.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/words_their_way_assessment_paper.pdfIn PDF document text
    • https://cdn.sqhk.co/gipagigo/iajE5sC/fudubasijikanurusa.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/what_anime_is_one_punch_man_from.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/gjjcjj6/20891561673.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/tiny_homes_plans_canada.pdfIn PDF document text
    • http://slmit.space/950876734934kh77.pdfIn PDF document text
    • http://lirudizulizi.iblogger.org/60856123240.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/PfEgjgc/mens_cotton_cafe_racer_jacket.pdfIn PDF document text
    • http://lakenamazaga.iblogger.org/biologically_important_molecules_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujuvisesakok.myartsonline.com/bonezat.pdfIn PDF document text
    • http://vulekagezefodek.rf.gd/zidadatusulajadusoba.pdfIn PDF document text
    • http://webidiwotew.epizy.com/8111934857.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/bukilututusulaxuzefin.pdfIn PDF document text
    • http://buketoxepebaf.epizy.com/bible_book_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/sopifabatebomenej.pdfIn PDF document text
    • http://ximagutetala.epizy.com/riwuduvifuvobogiwulajox.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_off0000cfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB4 5592 bytes
SHA-256: 90711cd3fd52e569e8f7bab7ac540ee7f372330594f43c1d09e5c0a03ce03d36
font_01_sfnt_off0000e28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28A 9528 bytes
SHA-256: 224211ab1a3e439eec0d54d4f383c87e2fc729d619bbbd95d746f00544317eb3

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