Malicious PDF — malware analysis report

Static analysis result for SHA-256 8108e0df23957439…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 04:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9a79211e661a8514713e63ea56293dc2 SHA-1: 372b6a28d9f86308ebfc67936c25a0c547b88fe6 SHA-256: 8108e0df239574390b9327a9ff0ca8afa0695583192b31c4ee1d29848e3b1ef6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely leading to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, potentially leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://proxus.nl/file/98291130880.pdf In PDF document text
    • https://tallerescarrion.com/uploads/file/69009110897.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/94526628062.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/rukonig.pdfIn PDF document text
    • https://kimcert.net/E/file/1507168354.pdfIn PDF document text
    • https://wsbtitan.com/images/file/donepuxex.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210908_220346_103.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/31737829644.pdfIn PDF document text
    • https://coil.hk/upload/files/30637538950.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/78299079010.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/gepoz.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/kelubezewivulosetorotage.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/92931187655.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/famaroxiwepasowosujuv.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/pusazimajovawagi.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/mesoxezuvirofibe.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/5333377787.pdfIn PDF document text
    • http://tokado.ua/media/file/gavinut.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/9223657435.pdfIn PDF document text
    • http://teakdeck.pl/files/file/77722265339.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/79195554519.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/88834209785.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/91970905896.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/raluxonosadavir.pdfIn PDF document text
    • http://simoncaulkin.com/images/1698931588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=angry+birds+nesPDF 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_off0000af9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9B 15648 bytes
SHA-256: e2f59bcc41da2b717fff8e21a73e55354e8b45437d74d5810f7a183feecf41b4
font_01_sfnt_off0000d75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 10232 bytes
SHA-256: bbdd60a229f18141be096a24e739837df35e3f6cb16f33e32490b89f97090e26
font_02_sfnt_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1