Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a961c4446417aee…

MALICIOUS

PDF

79.8 KB Created: 2021-09-10 00:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e5e2335242db5c64e2d1eb5aa4b7b2c SHA-1: 20073ffa06bd894b6b804d1dc13da7b229f3eb53 SHA-256: 1a961c4446417aee90a741407924770cd68528554efa5a5badabcece7e58ec15
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 structured as link farms, a common tactic for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cingenito.ca/upload/editor/file/43436925434.pdf In PDF document text
    • http://banquat.com/userfiles/files/zurewagikekemir.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/78494775779.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/wuvaduginoj.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/verasabotijapudidaruxevit.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/40521486079.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/lurodopebirekudat.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f95a25b461---kudonisolitaluzamid.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/99285741181.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/tudawiv.pdfIn PDF document text
    • https://lesura.net/userfiles/file/2600069576.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/vukufiwawugumixetoz.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/tijugitagonomibor.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/20908762208.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/jedegapejipaxikapozuzexa.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/zisilubuwi.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/33726232397.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210909_04806BCCDAB6EE23.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/89160746933.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/4fa6d079e91dca4777a2a85fab4ffa8c/kutasavizapezija.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/2300436286.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/kaguviwewadoletekudigided.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/silorabusodaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+emojis+copy+and+paste+for+iphonePDF 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_off0000c997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC997 11064 bytes
SHA-256: c3312e8d1f363cb194334dbb533bf2f95c6cea2fc2c81e60cf33dc861acbecd8
font_01_sfnt_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 21168 bytes
SHA-256: c4f988cc8f768241553b5b7b92806ce84ae08d8d4f6b99bb0bf9ed23b4c3db65
font_02_sfnt_off000119e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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