Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd16606d8e9097c…

MALICIOUS

PDF

79.2 KB Created: 2021-09-09 08:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0471ace8183580299afc90cc2c7b53a9 SHA-1: faef01a03a8b13568afcf6172b3fce61a2820d1f SHA-256: fcd16606d8e9097c4321089d315d1e5e5e00ed341ed2dbbef880b04897a4dd1b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=car+parking+driving+simulator+mod+apk PDF link annotation
    • https://vico-real-estate.com/ckfinder/userfiles/files/23200433840.pdfIn PDF document text
    • https://akconta.com/uploads/files/zevapekus.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/juginig.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/nojeru.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/31109307865.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/3600221046.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/78994394873.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/zuxomejetirezi.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/26874652116.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/18708777758.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/15698594753.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/fuzegopiwu.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/97450624937.pdfIn PDF document text
    • https://ksboutlet.com/file/files/jikusedamikezadarakixu.pdfIn PDF document text
    • https://uudanbury.life/files/file/13113093180.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/rorewerovasumuluviretu.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/45919851321.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/87a62557c7838e3041e70544e333ae92/xijej.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131933f29656---xasimasafufexabor.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/71643522679.pdfIn PDF document text
    • https://proia.bg/userfiles/file/48190139602.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/82875150715.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/87831070491.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/65421156000.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/55035244641.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_off0000cfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCA 17636 bytes
SHA-256: ec6d50d1615af824ca7b746e48b9d2dd5ce66acfb115831213038ab69fc8c626
font_01_sfnt_off0000fdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFE 10892 bytes
SHA-256: d1242df735e1df33783d780db169cb6da7daef1a3804c16eef8b12b7b6545005
font_02_sfnt_off000116ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1