Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6738667d3bdd662…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 06:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d2c78ed22a310fe981e1336fb91d32bf SHA-1: 3f738e78dd181caa7cd622f276cc73fbae7d0c87 SHA-256: c6738667d3bdd6624165cf4a1b8fd0603aae96fe63a7955d3472791c283658eb
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the link farm heuristic point towards the document's primary function being to redirect users to malicious sites, likely under the guise of providing media content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pistant.ru/uplcv?utm_term=blade+runner+2049+full+movie+free PDF link annotation
    • https://conexkarvan.com/cache/fck_files/file/49419847403.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/gaxevavemugeler.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/202195341247766.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210912132819_0ksbm5.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210913200945.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/rotiwamizemufigifoda.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/91141099307.pdfIn PDF document text
    • http://surtek.biz/image/files/20150320_141624.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/33739462411.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/11726859714.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/35017933358.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/46732718845.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/gelukok.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/48430163355.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/6401328023.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109162134439847.pdfIn PDF document text
    • http://gaudi.tw/upload/files/diwijebezigif.pdfIn PDF document text
    • http://na3.it/misc/file/fulumenat.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/38256138153.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wofesololido.pdfIn PDF document text
    • http://vizcsap.hu/files/file/gotebog.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/18067051234.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/61221794037.pdfIn PDF document text
    • https://razredna-nastava.net/files/31479777034.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/senolisifubiworesasetomo.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/wagef.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_off0000d12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12C 10956 bytes
SHA-256: 4a17fbd7dfb081370634e4365c3ac4f4a7584e1ca00f5985f7326f27e7a2d5ad
font_01_sfnt_off0000ea95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA95 18108 bytes
SHA-256: 3e651f92b8e5163575983ab49342355c8114ecc21de076ce229a8146c92c70f9
font_02_sfnt_off00011970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1