Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb7875a9b67bc23…

MALICIOUS

PDF

75.0 KB Created: 2021-09-11 08:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eca7adfe3a3a6dba93c10452d884e2b9 SHA-1: f1ed654ae7890de6c83504afa336bb6130de5e08 SHA-256: ddb7875a9b67bc235222bcff693fc1ccf67759a9d22f4331da4c7917e703e6b2
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a password-protected archive lure. The presence of numerous external URIs, many pointing to PDF files on potentially disposable hosting, suggests a phishing or spam campaign. While no scripts were directly extracted, the PDF structure and the nature of the heuristics strongly imply an attempt to deliver a malicious payload, likely via a password-protected archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://kamnitikamini.si/upload/files/58950569968.pdf In PDF document text
    • http://studioguatta.it/userfiles/files/1576099581.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/67293914804.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/raxulegajavuju.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/4384954407.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/52979891555.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/vcdqsa0gbhqusbu8ts9hohjmeg/witasugi.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/42078404818.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/92728562404.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/44324051767.pdfIn PDF document text
    • http://quranday.org/userfiles/file/rajeke.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/tipomavipuxonulenijoki.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367eb3cfcc3---jozejekezorijadeti.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/pazovawomadutugepofowo.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/gukilizebazovevotute.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/jonatimude.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/33044807616.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/7289470123.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/sinepe.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/kedujo.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/rozebopoz.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/jupatufefikarivizum.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/60843973172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=free+spins+on+coin+master+without+human+verificationPDF 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_off0000c27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27F 10928 bytes
SHA-256: c9020d3dad4408fc610e396749840bc2608df201bf509dc940b821883744a010
font_01_sfnt_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 16432 bytes
SHA-256: e4b053c68cf6dc88cd80673eb5f75de6e9137067faa1b2164a3cbea172b667d9