Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7f297258ffd00e…

MALICIOUS

PDF

72.2 KB Created: 2021-09-18 10:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ea0a239d75a75dd9cc9d62b88e7fee4 SHA-1: 0023ea76e9455cb590d841d91c4d7f99506e758a SHA-256: ed7f297258ffd00ed75bfdd41bbc5d287a4df8f0b4ada8e858ac5550b2211f0a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect the user to a malicious site or download a secondary payload. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://creativitagh.com/pevron/www/img/file/pugewevobulu.pdf
    • http://aweibel.com/Photo/file/nalabajen.pdf
    • https://catbasailing.com/upload/fck/file/61391171268.pdf
    • https://successalpha.team/upload/files/rikubugusuzonofapij.pdf
    • http://giaodantanthaison.com/Images_upload/files/67976035427.pdf
    • http://fw-simple.com/uploads/files/kedifor.pdf
    • http://ourgans.org/userfiles/files/69250533731.pdf
    • https://millvalley.com/wysiwygfiles/file/79600061814.pdf
    • http://allaboutdowney.com/userimages/77624103601.pdf
    • http://suriyedostlukdernegi.org/image/files/83870565092.pdf
    • http://vuonlan.vn/data/upload/files/889552739.pdf
    • http://ceomit.com/fckupload/file/61156206175.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331419d0e5a---jikivugo.pdf
    • https://webkapper.nl/ckfinder/userfiles/files/14589523820.pdf
    • http://ambulatorioveterinariocigliano.com/userfiles/files/gofigivafijadibejovame.pdf
    • http://uekekb.ru/!upload/files/90436487962.pdf
    • http://elverum-revmatiker.no/images/file/34872795038.pdf
    • https://profix.fr/ckfinder/userfiles/files/gizulajemoluduni.pdf
    • http://trunghungplastic.com/luutru/files/975199702.pdf
    • https://mbzl-pro.xyz/web/img/podborky/files/60810761437.pdf
    • https://biographiewerkstatt-singer.de/userfiles/file/72159442781.pdf
    • http://sportschoolindex.nl/images/uploads/larikukebutosudumuta.pdf
    • http://cuadepthanglong.com/images/ckeditor/files/xavabenebodowaj.pdf
    • http://studiofapas.it/userfiles/files/nurididawula.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=vidmate+4.1807+download
    • 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_off0000b78b.bin
f10d81c33b609832d753e7342ffdf1a925e8a6bdd77c625d3eb4c8d32c2171b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB78B 10772 bytes
font_01_sfnt_off0000d074.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD074 16792 bytes
font_02_sfnt_off0000e886.bin
6cf0a222f40dec01da0b2d4adb07d81201d5aa7d99dd93ea90be81b8fce4b7d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 16652 bytes

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