Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1216dd3fc174249…

MALICIOUS

PDF

78.5 KB Created: 2021-10-01 20:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e176b2a95c231c266727060ff5263932 SHA-1: 735fa55f4c9e8874d5cdaa0e5b99102dbff9312c SHA-256: d1216dd3fc174249f1c4755bc8dac5c486ae0f86a1f1db4fe5b272cd356d7e51
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=pokemon+gba+gigantamax PDF link annotation
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5d435a975e898d48e432902841d29957/debebufi.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/89590721031.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/35592596559.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/sukizakoxu.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/13995265677.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/199924557861568a5a67be0.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/kefopidajomik.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/95115252437.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/lakakipelezasazetifaro.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/gojud.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/fezesipez.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/53098296881.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/ginuwobob.pdfIn PDF document text
    • http://inistor.com/ufiles/files/76145178142.pdfIn PDF document text
    • http://xtra360.net/campannas/file/nuritamajilinefaz.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/genoj.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/22409448956.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/muzidanojap.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/28698833427.pdfIn PDF document text
    • http://klpa.net/userData/board/file/volarijekimomib.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/45114722215.pdfIn PDF document text
    • http://foxadv.net/file/ropabegujesanirivebakok.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/sukuzarivakixuva.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/41124917115.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f09c5cf27c---gebuvaleroduwabowu.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35A 10472 bytes
SHA-256: ae840b1fa2315ab43383e9750d7a2f6da76cef5f4de33822014de16a76cd782a
font_01_sfnt_off0000db2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2D 21436 bytes
SHA-256: 0959eb358253036b37c6e1230ef2b4bf55bdd87b8ff8a314212060274027fdb1
font_02_sfnt_off00011417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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