Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa8124b437369c7…

MALICIOUS

PDF

68.1 KB Created: 2021-09-24 02:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc4d20ba2467275d79649f3161485633 SHA-1: 2497fe1494b4b91fa20b4970779c8a2f8e2a32f1 SHA-256: efa8124b437369c7e1cb0e29b25c1e424c5c858552670ad981439774f2aae0b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm with numerous external URIs, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mgc.to/sites/web/upload/files/xagefejemaz.pdf In PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/pifirovekemi.pdfIn PDF document text
    • http://guchen.ru/d/files/tusulefimusudimeto.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/26735711539.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/nametipoduwulomosokuwedi.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/80099696767.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/mewedunididejazonuxozibuf.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210907183144.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/vumewogireku.pdfIn PDF document text
    • http://allier-genealogie.org/File:/90125027935.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/43886755344.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/27198500519.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/burapagodaki.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/81928460079.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16141670ae7c4d---lusukajijuxeg.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/679261172614c5850b9083.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/ritatoluzutexukovoxi.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/mawutupatipotolabeg.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5n3nllemqu4qseh4g9dord9ro7/83543316941.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/8630575591.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/sonigidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=playstation+4+gta+5+cheats+ps4+phonePDF link annotation
    • 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_off0000ac58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC58 10880 bytes
SHA-256: 9fadd82af19186f446dee4dc0654e90f35a5d7d34f84d865f3b441501a28f542
font_01_sfnt_off0000c59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59A 14724 bytes
SHA-256: 59acc3735429fa1d6c86136cc9bb37ee8d3e4630fea522ac4a92cc785334d129
font_02_sfnt_off0000eaae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.