Malicious PDF — malware analysis report

Static analysis result for SHA-256 93228f827bd5bc61…

MALICIOUS

PDF

73.7 KB Created: 2021-09-14 15:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b58d66a715f0bc68b10bc26ccd72f814 SHA-1: 847af2f4ddd3e1120863feffddb92cf4701a6987 SHA-256: 93228f827bd5bc61bbe312121adbc6660fd75e4a65bc570c3be16c378c578727
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with some pointing directly to IP addresses, indicating a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a large number of links on disposable hosting, likely to obscure the true malicious destination. The ML classifier and ClamAV detection strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • 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://medvor.ru/uplcv?utm_term=download+minecraft+for+free+on+your+phone
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/79725124461.pdf
    • http://fisioterapiasuzzara.it/userfiles/files/bojagibowaf.pdf
    • http://157.230.241.115/image/upload/File/74844716003.pdf
    • http://kcpsystem.com/userData/board/file/42992146521.pdf
    • https://sandipkumardutta.com/ckfinder/userfiles/files/82405921079.pdf
    • http://webinaris.eu/ckfinder/userfiles/publics/files/faxuvupugosogojiteled.pdf
    • http://bjjiffy.com/upload/nabiguweduzipoj.pdf
    • http://fitsiluet.cz/data/file/44338755771.pdf
    • http://interstroy96.ru/uploads/files/73420696313.pdf
    • http://seattlebestteriyaki.com/uploads/files/53018552591.pdf
    • http://jfac.kr/ckfinder/userfiles/files/jivokimidosifusemorip.pdf
    • http://kolaykanal.com/userfiles/files/pajov.pdf
    • http://lotusburbank.com/uploads/files/veliba.pdf
    • http://villabrown.it/userfiles/files/44482681220.pdf
    • http://proficlim.ru/public/userfiles/file/13778497385.pdf
    • http://xn--d1achljw0b.xn--p1ai/content/upload/35802761974.pdf
    • http://giorgimpianti.com/userfiles/file/xinup.pdf
    • http://areaengineeringsrl.eu/userfiles/files/musibedefemovefusetodeb.pdf
    • https://shevtsov-art.com/uploads/files/20967326313.pdf
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/ritudufopubiradudesumaf.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/muliwixolifaxakedik.pdf
    • http://viettranslators.com/webroot/img/files/zunobelexirinukedawukiri.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5225dd931---15212630546.pdf
    • https://basundharamart.com/userfiles/file/89225484755.pdf
    • http://asupuro.com/user_data/image/file/79808402767.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_off0000be40.bin
3adb2668aad394bf8c358ef427fd8f404cda088b53c2ef967ed6faaadb0630a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE40 11020 bytes
font_01_sfnt_off0000d7a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A7 16792 bytes
font_02_sfnt_off0000efb9.bin
97a35462fb7140e536c16c5bd995941a4b0d9a7e6ea75465b845899f2e8b1855		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 16024 bytes

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