Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef88fb999605f0f6…

MALICIOUS

PDF

83.0 KB Created: 2021-09-24 07:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11051fc26b67853189933fbb316e0777 SHA-1: 6324e82f8eea28ff51ad695a281cc92d47ac8972 SHA-256: ef88fb999605f0f609060656421d128ec87ebd3970a9fdf19f2dedf82085d472
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also includes numerous external URIs, with one specifically pointing to a URL containing 'uplcv' and a search term related to game hacks, suggesting a phishing or malware distribution lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a large number of links to potentially disposable domains, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://huntic.ru/uplcv?utm_term=candy+crush+saga+unlimited+lives+hack
    • https://khabul.mn/mmpa/userfiles/files/75480315298.pdf
    • http://another-partner.morefriendship.com/upload/files/68475209195.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/dofuzewu.pdf
    • https://jogamiskolc.hu/ckfinder/userfiles/files/xufis.pdf
    • http://tivatijapan.com/uploads/userfiles/file/xudewivujovob.pdf
    • http://salamatekhanevadeh.ir/ckeditor/files/files/46101978836.pdf
    • http://orzo.cz/uploaded/files/28373026547.pdf
    • https://artlabjo.com/userfiles/file/diler.pdf
    • http://busankid.com/webfiles/board/file///pometi.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/83959332173.pdf
    • https://office-agglo-larochelle.fr/userfiles/file/wowavo.pdf
    • https://salwangurugram.com/files/75237222103.pdf
    • http://steakclubhn.com/campannas/file/73836960773.pdf
    • http://brkvinc.com/userfiles/file/welipaf.pdf
    • https://xo-sound.ru/userfiles/file/kigobonotokitovarugofi.pdf
    • http://shopsuathientu.com/uploads/userfiles/file/dubibelomogoseruvibas.pdf
    • http://sunil.kr/uploadfile/fckeditor/file/37156304697.pdf
    • http://lamardaegu.com/upfile/user/file/47414543168.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f8cd2040a---47171505064.pdf
    • http://sostrevalli.it/userfiles/files/64237401373.pdf
    • http://irpuyesh.com/cache/fck_files/file/sonipibexajuduvuxa.pdf
    • http://m-styleauto.com/js/upload/files/75390452369.pdf
    • http://szm.hu/userfiles/file/bipuliwokusuwesezepe.pdf
    • http://bayernglobal.de/userVZ/file/xulexinumijofuvuwe.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_off0000de90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 16792 bytes
font_01_sfnt_off0000f6a2.bin
0815afeeceee78abc08cbd443898b34c08d27c8d2dd1c7a4f0afb3dbce0ed63c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 17624 bytes
font_02_sfnt_off00012466.bin
d7fe7cbda6dc875ccca08ef11052e2aaa0b06fa2367ac522cd12e10a78f953c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12466 11100 bytes

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