Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97b3b359faa477e…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 22:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9e8956c88c7aaa179b3f754e16e4400a SHA-1: 619243fd36a28b97754d6b2c992fb6ad9ff2ada3 SHA-256: d97b3b359faa477edd3fc4542d4bfbf5d900f5784658518e4282df3f68ec34a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect users to malicious content.

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://krisoc.ru/uplcv?utm_term=android+studio+get+gps+location PDF link annotation
    • http://nissanotogovap.net/uploads/images/files/99092129441.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/35791322037.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/95775476306.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/gesefabefovidenaw.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/85930818209.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/36687342179.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/kaxotedaluvuzazile.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/xewuwarokazusaribatarugo.pdfIn PDF document text
    • http://masonhn.com/d/files/53868872321.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/92881601679.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/wobutoja.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/56506756105.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/91545363403.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/suwuwelipinabujotego.pdfIn PDF document text
    • http://cataga.de/beta/files/file/wizabobewajaxugasinururi.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/meragulevamij.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/249e3ff238c38406a8dbeb1d0bd56948/gerizokodiwewe.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/pekagivelom.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/zilunokavo.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/27771563045.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/92465811936.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_off0000ac81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC81 15840 bytes
SHA-256: d656e064d72c16f085da19dfe15616001a49c3b661227bee304d07348d83a600
font_01_sfnt_off0000d4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC0 10768 bytes
SHA-256: 19122e0b135b255e6f0405b2d16409bb208b18cada8f5c4e0524729c4619233e

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