Malicious PDF — malware analysis report

Static analysis result for SHA-256 683679d757776677…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 13:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 122d63e134aaefaec1f9e27eb93bd900 SHA-1: ac00f5a27031e581af1cd08fd8fd495901cd2c93 SHA-256: 683679d757776677d4972c34b9fd858e3472360e09b7d1a78e2529845146cc25
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm and contains a callback phishing lure, prompting users to call a number in a deceptive context. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites or initiate fraudulent phone calls.

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.
  • 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://chcial.ru/uplcv?utm_term=avoiding+eye+contact+body+language PDF link annotation
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/73571038569.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/gaviwowuwob.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/32422890825.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/bejegijonikug.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/76982670520.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/31468684346.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/gegosor.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/63119765810.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/41663043324.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/lelazujapipitupexozato.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422a8305590---vovugugowirawurirabo.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/42831461455.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/kotakidifumu.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/regokopalapejarilele.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/26103368188.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3c7f4208---31191314404.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/1102634211.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/57625566455.pdfIn PDF document text
    • http://metabolit.ru/files/file/13710250220.pdfIn PDF document text
    • http://sial.pl/galeria/file/12273802460.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/57760223453.pdfIn PDF document text
    • http://koutingchina.com/upload/files/tuwovarefixag.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/mudilaxokareb.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_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 17392 bytes
SHA-256: d413b895409634bcbc91b6213227cb7aaa4ebfa42b240ba66224789289a43e20
font_01_sfnt_off000108d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E9 10676 bytes
SHA-256: 15f584edd4d1fb9dbe464daff5c08ec2c9ced5749bfbba2c4e571c4a9185f25b