Malicious PDF — malware analysis report

Static analysis result for SHA-256 739284979d3b9901…

MALICIOUS

PDF

70.8 KB Created: 2021-10-04 01:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a68ee8fdaa9f6ecfcc322461c399f6bb SHA-1: c8056c02790214c223255ec1a070f812c251aa48 SHA-256: 739284979d3b990144dd8c72f1bf5dcb4294766f712d44a42d140429d3798422
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely as a phishing lure or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://tuivaivietnam.com/uploads/files/defikoziwanis.pdf In PDF document text
    • http://sujitonweb.com/userfiles/files/13967446445.pdfIn PDF document text
    • https://totounited.com/contents/files/xexumusa.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/61910413690.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/kovovosodataralamo.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/10178922251.pdfIn PDF document text
    • http://autovoda.ru/upload/files/77139387144.pdfIn PDF document text
    • http://losangeles.songhakbbq.com/uploads/files/kisiloxose.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/razak.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210905194436.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/31816406236.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/65911511138.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/kepevulefukeje.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/kibibitudaxinisusoxode.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/dexebejomivusepud.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/86733940352.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/68334609691.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/doxupaveduduz.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/lodasigebotisur.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/kiwapidedufodas.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a134ec5db49a643bb759871cf8ba8b4/foxikamikewugodenorali.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/91426596107.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/21617746230.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/mulamawafuwu.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/22995043023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=meaning+of+the+word+profanityPDF link annotation
    • 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_off0000b365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB77 16484 bytes
SHA-256: 63757b81c3b9a22a44a8efc7183b282f8e51ba313a3502a91f98d854303caaa7
font_02_sfnt_off0000f516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 10756 bytes
SHA-256: 4bbdeb61c2b4a186e8a6686c01c412898ab7fcf476b64de7661bb43c3d5c4000

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