Malicious PDF — malware analysis report

Static analysis result for SHA-256 97fac1ad91e24380…

MALICIOUS

PDF

77.3 KB Created: 2021-09-21 13:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4eab1af43f32a19b4e99903bde94a288 SHA-1: f8dbc2cb97fdea15ce4820b14ea425f0e69d03da SHA-256: 97fac1ad91e243808bc1455ebb041cafbca30a6960a58bd12a33c25d5c4111b8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in callback phishing and tech-support scams. Embedded JavaScript and numerous external URIs, some pointing to potentially disposable hosting, further support a malicious intent, likely to deliver a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • 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 http://ronaldtan.nl/images/photo/gufavumizexeninusaduzogif.pdf In PDF document text
    • https://omprintandpack.com/userfiles/file/zuduni.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/11461410138.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210915174605.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/fifugefiv.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/kugikakiriwinir.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/32240479603.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/95040554374.pdfIn PDF document text
    • http://creationart.hu/files/file/vewixeva.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/wegujolovawibede.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/kizolamasateranovot.pdfIn PDF document text
    • http://denge.aero/upload/files/weluwovamelik.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/a688ad18d9d398b97041aabf741016f7/86525802998.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16148b71ac8cdb---boxufamogo.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/72893637478.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109161549492383.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/9951521838.pdfIn PDF document text
    • http://slovoveri.org/userfiles/dimiwelebujuvamuwuxasub.pdfIn PDF document text
    • http://sergeybazarov.ru/file/tewokejerepelenoji.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/94393009220.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/2874213084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=international+economics+theory+and+policy+11th+edition+solutions+pdfPDF link annotation
    • 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_off0000c775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC775 11100 bytes
SHA-256: 711cf18c0d941e2e5bbc76a4b77d6019534792649de0b9c02ecfc94835fee3ec
font_01_sfnt_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 17836 bytes
SHA-256: 7b98287406775e0a2e7afeea57195638acef09017533b682742b372a34b469ba
font_02_sfnt_off00010f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1