Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbf67d1c5d416b9…

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 07:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2b061b2d407413eaea1e165aed70e13 SHA-1: 49b1cb5c620e2822d16e1b08abf5aed0d2372edb SHA-256: 9bbf67d1c5d416b955b116ff5e102bfeea1d557be6f696c8f5777646a3dc132d
134 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, many of which are structured as link farms pointing to other PDF files, suggesting a phishing or malware distribution campaign. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=minecraft+redeem+code+generator+2021 PDF link annotation
    • http://samocvet.org/foto/ck/files/76518851895.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/48806271714.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/50476018205.pdfIn PDF document text
    • http://strap.sk/uploads/file/92177094190.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/67713189204.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/9987434664.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/rodonel.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/43748999514.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/ligonija.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/pojitibigagujajal.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/rizodunadinate.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/vixijimi.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631311467.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/lunenubaxepisediratixoru.pdfIn PDF document text
    • https://tigapilar.com/upload/files/2292330043.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/manoseku.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/tizivo.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/xitolagapodomif.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/guronezupenofapodipu.pdfIn PDF document text
    • http://quetthe.com/upload/files/jarajar.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/vexijodinajo.pdfIn PDF document text
    • https://kmedebiyatgunleri.com/ckfinder/userfiles/files/68464412524.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_off0000da55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 10892 bytes
SHA-256: 112ac2377205d331a0b29ae202d8ec0301ddd6facb37d80d4c938dc2ef2a0267
font_02_sfnt_off00010b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 18460 bytes
SHA-256: 341f94143dc531361d1a712deefee5c68f5642d9b6d0b82bbed92ba60aed53ce

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