Malicious PDF — malware analysis report

Static analysis result for SHA-256 4280a7548c3a4455…

MALICIOUS

PDF

100.6 KB Created: 2021-09-09 06:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0e053d77da74498eb9510cde1fba937 SHA-1: a35a42c05b327a2c185313150a8ab1129751e496 SHA-256: 4280a7548c3a4455bc78da0b486566316609079344705823c03b17cf7eb300f6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to obfuscate the redirection or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gsm.company/ckfinder/userfiles/files/41541183423.pdf
    • http://sunwisechem.com/Uploadfiles/files/53913637335.pdf
    • https://jerseyshorepirates.com/userfiles/files/58519386287.pdf
    • http://canoeing.by/pics/files/lovetoxavimibinapobotul.pdf
    • https://thegioibaobicarton.com/Images_upload/files/xaxawaxedisiviligodumod.pdf
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/pisivukirobitolonow.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/61065446216.pdf
    • http://caogenzhiben.com/filespath/files/20210902115249.pdf
    • http://portalcom-b2b.es/img/user//file/_0397795001631142114.pdf
    • http://it-hair.com/userfiles/zuwanugurekifux.pdf
    • http://medizator.ru/ckfinder/userfiles/files/86065864087.pdf
    • http://odontotecnicacoop.it/userfiles/file/93182968490.pdf
    • http://nasledie-sluck.by/var/upload/file/vavuvurodilufoju.pdf
    • http://dagmar-e.de/userfiles/file/44332665723.pdf
    • http://kanalizace-ul.cz/userfiles/file/60376077851.pdf
    • https://chataigne-cevennes.fr/imgs/files/27051907000.pdf
    • https://hoatuoi360.vn/uploads/files/sokamitin.pdf
    • http://clear-es.net/yamituki-n/uploads/files/94691836646.pdf
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/fonalejubevubimogef.pdf
    • https://myshalewell.com/userfiles/file/pikogidodol.pdf
    • http://goddesshair.net/upload/users/files/49366443883.pdf
    • http://daieimotors.com/js/upload/files/kunirajetove.pdf
    • http://asr-net.ru/uploads/files/banopiwogululusexana.pdf
    • http://gocchame.vn/app/webroot/img/uploads/files/piwebolesuzi.pdf
    • http://usairsprings.com/userfiles/file/sozuwuletivir.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=supprimer+pub+google+sur+android
    • 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_off00011bea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEA 16792 bytes
font_01_sfnt_off00013401.bin
832ed8b96226fa38cdf69d5b80110e61429eec2ee8d944563521991ad6f214e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13401 10952 bytes
font_02_sfnt_off00014cdb.bin
625458f95d7eede3d53f415b5418292445112864361c2a59f9ac18379b49cb6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDB 21940 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.