Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb82948b0f38fe9a…

MALICIOUS

PDF

87.2 KB Created: 2021-09-18 23:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba7fe99c76cfc9737f0de3e8960599b7 SHA-1: 11da606079d4d00212aedeffe0a4613131145b3b SHA-256: fb82948b0f38fe9a4bde7216355e7b4334390abcaef30408a7bb1ded2bd81fab
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm or phishing campaign. The heuristic 'SE_URGENCY_LURE' indicates the document likely contains text designed to prompt immediate action, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jechrina.gr/FCKeditor/userimages/file/57208499141.pdf In PDF document text
    • http://icltindia.in/userfiles/file/mijise.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/46660721829.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/6721449409.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/92655452.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/5340608088.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161422d21140d7---17083904090.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-5/20210905150704874175.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/roketapajegazabaz.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/89948413604.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/petabuwisatupufipazurudut.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/45901969412.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109070644056919.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/93608534728.pdfIn PDF document text
    • https://laser123.com/geektic/files/biduti.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/karevasavumelepezowotij.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/18509306185.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/afd09d61cc0ae32e1775f10d0a50fa46/69416951268.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/pepojaxa.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/62889926188.pdfIn PDF document text
    • https://ijp2.com/contents/files/25557305174.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/4175148607.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/84976398056.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/totobilukuvemopavovax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=fonts+emoji+and+font+keyboard+apkPDF 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_off0000eb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB38 11064 bytes
SHA-256: bef81aa7db807925948994f5dfe8c98b8fd29339d48bb86fa4f6a285840e8dfe
font_01_sfnt_off000104bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 19152 bytes
SHA-256: 8a66508914826dc35539e99618513e550b361ffe5611572561bc2607035aa326
font_02_sfnt_off0001373b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1