Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c6a540f49b7ea5…

MALICIOUS

PDF

80.8 KB Created: 2021-09-14 11:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ba75b68a77ea049cd7cb11f941783d1 SHA-1: 4b27e9f957136cd7c64cf4cf99e940163613814e SHA-256: 80c6a540f49b7ea5651c719ee4b32cbf5ec793ec15e06c0a7c6fd78fe10f916d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the final destination by using multiple disposable hosting domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pixomot.ru/uplcv?utm_term=how+to+stop+autoplay+videos+in+chrome+android PDF link annotation
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/gatoj.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/34205297252.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/zagawaxafulufumeretewo.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/mujilarudezimelunixis.pdfIn PDF document text
    • http://surausa.com/uploads/files/xazoxewape.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/40643188346.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/xarupisabaneminuxazuzar.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/fokafoxelirif.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210908023037.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/mekenakunivodu.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/pezuzowiw.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/zikureganizamavul.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/rinuvefezimo.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/27146408644.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387cb0c01aa---ziridoboduluba.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372d014c2b0---tovumivulorabaletovoderod.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/4576229762.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/mopejeb.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/75685589691.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/muxenogibuzop.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/65780317790.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_off0000d55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 11136 bytes
SHA-256: 6103b3eaa28a36bb7fea235bb5ba643b5461dc8113805a9894f3b9125103b8e3
font_02_sfnt_off00010748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 17948 bytes
SHA-256: 6b24466aab656393505b8084b121a9c3c477b24d72bcc06b80ed14359e4f6e65

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