Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41bb7d874259483…

MALICIOUS

PDF

69.2 KB Created: 2021-10-03 02:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f9f6f7d67eec1207471046d1da21b692 SHA-1: 6ae1b081600b23b82f08ccdef91d1ccbdd2f6e1d SHA-256: b41bb7d8742594837344dec851b160afbeb7b3501addca2938446da061afe2ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful websites. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

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 https://krisoc.ru/uplcv?utm_term=effect+of+substituents+on+basicity+of+amines PDF link annotation
    • https://hkpefa.org/editor_upload/file/67630361704.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/zafebavovoragusonudofe.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/xibovasodekuxapo.pdfIn PDF document text
    • http://medica-brno.com/files/neledaderutafo.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/bafebumesamas.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/60342219227.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/lazil.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210925_61C82A4A5CC346F8.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/85030743283.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/biwewojukoleju.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/4986302985.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/pitunabejewebugixo.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/36225788942.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/vebedemabirofedixifaresel.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/66074427487.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614f90daf2b1d---20680424107.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152d227d5417---9734731683.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/zapobunamilafiregib.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/4887115533.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/96688851187.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/lanaxagasutanipotor.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_off0000ac63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC475 16516 bytes
SHA-256: aac87ca9c6099d32b7e139551ba4d50a44ad827c5cb25353a165f1ef9380bbcb
font_02_sfnt_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 10688 bytes
SHA-256: 778050c7d4d8d1b03d640ebcbd177cd327ae5cb461f8073519001dea66657da4

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