Malicious PDF — malware analysis report

Static analysis result for SHA-256 09daf7d51f8bc93d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 05:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f090c0177d2faaaa843d209d46bd9bbe SHA-1: 886284208565bb4b4c5c3232ab9c2d8419c15c9e SHA-256: 09daf7d51f8bc93d1eca8733f6122bb464e1c3a6b655305f1d2517a45683be3b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection (Pdf.Phishing.Trojan-d2568dad23a94d95) and an ML classifier indicating maliciousness. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=font+fix+apk+download PDF link annotation
    • http://npi-management.org/ressource/site-image/files/kovepiv.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/86462878928.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/38893323823.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/gamamedorodijewesewev.pdfIn PDF document text
    • http://chineseclothingonline.net/File/mapisurezosup.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/48765767748.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/rujixuz.pdfIn PDF document text
    • http://tdbm.vn/upload/files/61496593465.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/jiteveputeno.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/luxenulole.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/82605699080.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/gasotij.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/vesinigotenejamezorid.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/labudasiwem.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/zilojedudekobuz.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/35521813604.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/2564887537.pdfIn PDF document text
    • http://cl-pub.com/files/files/pofumofize.pdfIn PDF document text
    • https://triosms.com/userfiles/file/2719267868.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/tivosilosenurogirubod.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/75485618425.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210918_ADF4F51868C271F8.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_off0000df7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 10348 bytes
SHA-256: 4e6a6c122e7a5e3499a060c991c7d3c80a5dfd76edf0b4b13bcbf90b4b13bdbe
font_02_sfnt_off00010f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F13 18200 bytes
SHA-256: 0f29a0be254b0fc7a98da9cbfadb1f0dc1de4298c6bc84ffeb7ca954b75ee9cf