Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ffe38e1f521fa8…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 11:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 881ba3059c9d9e97efd1f150e095ce37 SHA-1: 677883e5eff6a94456907f480465d727ecf7dc84 SHA-256: c5ffe38e1f521fa89c297ace02a7b764549fd019139d29445b55f2f13dafeae6
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code upon opening. The presence of numerous links, many on disposable domains, suggests a link farm designed to obscure the ultimate malicious destination, likely a phishing or malware download site. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://investincarpathians.eu/app/webroot/media/files/64583530459.pdf
    • http://miskolciharsona.hu/pictures/file/40106526343.pdf
    • https://yarpaket.ru/userfiles/file/wipugovazumujunipub.pdf
    • http://abnigakgdsg.friendship-match.com/upload/files/wegawalutukidugofapomaro.pdf
    • http://pattarasawat.com/ckfinder/userfiles/files/41082643430.pdf
    • https://fcksa.com/ckfinder/userfiles/files/xuzitid.pdf
    • http://fireprovietnam.net/luutru/files/63817559069.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7843a35ad---75710522256.pdf
    • http://mqskin.com/luutru/files/fotonoziwete.pdf
    • http://gleb777.com/fck_upload/file/77873719264.pdf
    • https://spacio.hk/attachment/file/wixasuzakaputobado.pdf
    • https://habibitours.net/ckfinder/userfiles/files/50894466533.pdf
    • https://nestsearch.in/admin/uploads/file/favovagoxapetotelukode.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/31346490379.pdf
    • https://knurussian.kr/DATA/upload/files/202109140113216762.pdf
    • http://kiddeefire.com/media/userfiles/files/71076564510.pdf
    • http://eiffelflowersquesnel.com/userfiles/file/50613512149.pdf
    • https://rrr71.ru/upload_picture/4133367847.pdf
    • https://generalaudit.pl/eurostyl/photos/file/85661744172.pdf
    • http://spy-military-labs.com/userfiles/file/97618678467.pdf
    • http://giorgimpianti.com/userfiles/file/32864109563.pdf
    • https://scavilecis.it/userfiles/file/39980611164.pdf
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/witelometerapojukinejam.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=kgf+full+movie+download+hd+tamilrockers
    • 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_off0000e0a5.bin
9ca30478cafa59e40898fdb07a6e587c821609cc075fb7b7ec3167615e1c68b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A5 11260 bytes
font_01_sfnt_off0000fabd.bin
df38341d3d5e95f47898ec678cc2fa57734c9d99c3c51b12389596c5ed79a326		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 17224 bytes
font_02_sfnt_off0001275b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1275B 16792 bytes

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