Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac55ab79c44470e…

MALICIOUS

PDF

72.4 KB Created: 2021-09-20 04:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa92da7dcb9e09bf191236c0ae8ba55d SHA-1: ddb85f1763edf97f3913dee38f36eef5d549e5ae SHA-256: 6ac55ab79c44470eef5d2b0a06e3430f5c0d7286fcecee3cae2ba6490168d073
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 for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=dragon+ball+super+episode+110+english+sub PDF link annotation
    • http://n3ss.ro/ckfinder/userfiles/files/59963909736.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/5951732427.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/lutezorulofeserabapak.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/nanenanalunabofilateporer.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/19158880987.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109200130575756.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/geposijajetotujizisu.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/nitalakurokewanar.pdfIn PDF document text
    • http://soles2walk.cz/data/file/juranezudagejesixote.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/83323538520.pdfIn PDF document text
    • http://marketingnews.fr/images/file/18314291919.pdfIn PDF document text
    • http://northcity.rs/slike/files/vagabinifititefumamur.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/towuzixivasavokotesuvara.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/77122758951.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/70967012907.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/jawepozalopax.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/45798580036.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/tugadovidemimisuluxon.pdfIn PDF document text
    • http://chapelguild.com/images/usr/58618284867.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/38320630231.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/56603882496.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/gefatalapolilozawokatuju.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb9ccc3cb8---9084153468.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_off0000b9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C0 10988 bytes
SHA-256: 368ae68a46050a0b53b6363a31f9469315014a75e57b0f8b6f03e476dda145b8
font_01_sfnt_off0000d2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B0 15968 bytes
SHA-256: f83f4c58bf07ce96e1f83325c81de932f02a856768ed6ac989b60154419868a0
font_02_sfnt_off0000fbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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