Malicious PDF — malware analysis report

Static analysis result for SHA-256 98abaea61cfa9c69…

MALICIOUS

PDF

85.3 KB Created: 2021-09-12 10:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2642de9cf09f80abc1c5ac4f1dda30fd SHA-1: c78042a3661cc6d52609fe3ac6c2df05e0a4aea4 SHA-256: 98abaea61cfa9c694041c91a3f26bd1ddb35f31e15f72437fb5ad4f32b9bb461
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The PDF contains numerous external URIs, many of which point to disposable hosting and are structured as a link farm, suggesting an attempt to distribute malicious content or phish for information. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a likely intent to redirect users to malicious sites or prompt downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=snes+android+emulator+apk PDF link annotation
    • http://www.jobsincrete.gr/images/_user_na/file/72495694640.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/70322672929.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/36150401482.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/tubevefasidoriwixezivo.pdfIn PDF document text
    • http://blccy.com/userfiles/files/tisesugaxe.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/vuwitak.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae2c8bc772---90362272583.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/rukabot.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/34241585964.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/kolalipuxise.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/25688858982.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210911115751.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/40758842696.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/oc67krh6drlj852pob1k37j856/14767448174.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/jepamusenivodupip.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/29974175076.pdfIn PDF document text
    • http://bamor.org/userfiles/file/92277705122.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/xodepi.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/lolanizoketur.pdfIn PDF document text
    • http://pvvc.cz/files/wijulomakeb.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/99557338900.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/24373565319.pdfIn PDF document text
    • https://energooptima.hu/upload/File/lutagepegogubidafe.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_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 18264 bytes
SHA-256: 2e3b2d1b686f7a4df393538251b022f0bce7fa785b942bab469990709760ff7b
font_01_sfnt_off00011677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8E 10820 bytes
SHA-256: f9a2159d038d0c70b392e3ffa9869cb88856247fc88908493d1e8371e504860e