Malicious PDF — malware analysis report

Static analysis result for SHA-256 efad0a9c2afbded5…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 14:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f8a23f00c6497813a74ecb1a786f7b93 SHA-1: f6f7bad0e12c0f3cc932b2efd7144c515e2cfdca SHA-256: efad0a9c2afbded5c74dfedacbb91d1db0cd823ca31672c83ceee5786c0bdcf8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a phishing or malware distribution attempt, likely leveraging T1566.001 (Spearphishing Attachment) as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=raspberry+as+tv+box PDF link annotation
    • https://baptistfriends.org/media/24273777023.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/2780096562.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/87680265929.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/7452839070.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/44174673126.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/95468942806.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/xoxavipijuxaxu.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/tetagesaguw.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/1601857460.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161358b4c698c5---fakiboputotuvujov.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///70765539695.pdfIn PDF document text
    • https://tebra.si/userfiles/file/77196016072.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/mibigeragusi.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/18951916695.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/bosufazetodinogowajaxer.pdfIn PDF document text
    • http://haphadoor.com/upload/files/7063921654.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/95817810551.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/27648868260.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/87632637947.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/mavubafugonipuzu.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/29935525824.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16149f00dea523---xekuxusifedi.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/47390197950.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/59263848430.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_off0000ad72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD72 15972 bytes
SHA-256: d4843f68612e232578f8f0c6cd8f604b384135175fcd880dc518fc720524f044
font_01_sfnt_off0000d635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 10472 bytes
SHA-256: 1c4058169640a1471e24eab9dc7463a0b4466c57fc8213ced6c8a7d169568c68