Malicious PDF — malware analysis report

Static analysis result for SHA-256 3162766a5698c7f6…

MALICIOUS

PDF

85.9 KB Created: 2021-09-18 10:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c0fa6d8a2eb9e6efd2bf47abe2cc9d4f SHA-1: 5f39e9997c02fa175b6eda0e37849e77fc445831 SHA-256: 3162766a5698c7f6c651550d5e175ea5ab910994a804712253ff4f30b37eba26
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 malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=how+to+turn+off+4g+on+android PDF link annotation
    • https://marljivo.hr/userfiles/file/saregejotanekufulejopun.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/xakulirafalenovalulu.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613053ec0d380---84435844914.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/lojisunotemanupogi.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/13473622589.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/vusuno.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/sigasuzonobotom.pdfIn PDF document text
    • https://renetravel.ro/images/files/niretowapipexogu.pdfIn PDF document text
    • http://ingore.cn/upload/files/61692529498.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/v5tqqumnod5786jhm37q8hi8o2/wogunija.pdfIn PDF document text
    • https://naves.cz/res/file/55876979063.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/19300405141.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/fezujerifufesekelokori.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/debijarexut.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/92318146259.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/30074759313.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/29197011241.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/nitedujewolamokodu.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210901174811_NTg4NDE3NTAyNDQ=.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_off0000ea57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 18664 bytes
SHA-256: b24dfbd66cc11b1331079758dfd03f4aa920a5e5d4813a407cec0a25c3e457a2
font_01_sfnt_off00011a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9D 10436 bytes
SHA-256: 16be57f3699b552ef46db031119a5fa8b26ad398e6c7ee87c1f1b5f6a1387d3e
font_02_sfnt_off0001323c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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