Malicious PDF — malware analysis report

Static analysis result for SHA-256 631d59655c94e932…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 03:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b02f158ab05b76385e661d4990904d27 SHA-1: 6742cb3889e4febd74767aee74cea1b2fd47bf2c SHA-256: 631d59655c94e932368bc3b4d4438701961f4bec9df217f4dbb9ef4a600a76c2
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, some pointing to IP addresses, indicating malicious intent. Heuristics indicate it's a link farm and a callback phishing lure, suggesting it's designed to trick users into contacting a fraudulent service. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=imo+old+version
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/45799456219.pdf
    • http://rialta.ie/userfiles/files/77368846237.pdf
    • https://pima-alarms.net/slicice/file/19644301323.pdf
    • http://thanhnienxp.com/vietkiendo/upload/file/ligumutizulux.pdf
    • https://izyskately.ru/foto/ck/files/mekazelikudavapu.pdf
    • http://e-hematologica.com/users/file/75795805146.pdf
    • http://tomaszfilipczak.pl/userfiles/file/58271415271.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/efnst976cobve9ajhq693dj1np/befusiniponipudelinikidi.pdf
    • http://kibunajcc.com/ckfinder/userfiles/files/bitudosup.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614408ed0040a---rakivokazu.pdf
    • https://bearings.vn/images/ckeditor/files/mituvudobomaguw.pdf
    • https://eric-parnes.com/ckfinder/userfiles/files/70694873757.pdf
    • https://surupaceanu.ro/ckfinder/userfiles/files/kokizodamosipozax.pdf
    • http://ei-windykacja.pl/upload/file/xakoridomovuliv.pdf
    • http://alltechsro.cz/files/difenuxofunamo.pdf
    • http://reicar.dk/userfiles/file/54656351751.pdf
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/kowute.pdf
    • https://belretail.by/ckfinder/userfiles/files/wenaletagurok.pdf
    • http://filtrydokoparek.pl/img/all/jodojalisifubofovivawa.pdf
    • http://rehahomecare.com/upload/editor/files/dosifudeg.pdf
    • http://psn-monolit.ru/img_file/files/68446877966.pdf
    • http://127.0.0.1/bantraicay/js/ckfinder/userfiles/files/petamubujipitimonukari.pdf
    • http://sirmamedia.com/ckfinder/userfiles/files/29167692719.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d766.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD766 16792 bytes
font_01_sfnt_off0000ef7d.bin
9376905bfec1a59fb117fc75817929aa8dd1f9b368d568a8c4478d473418000b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 10164 bytes
font_02_sfnt_off0001061e.bin
ae4fb56d45d6ef8aa567465479cf9449a833d1a36c7579749df4fab9919a08fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 20364 bytes

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