Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af3a339a45da93d…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 08:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2c2a76bcd01ce1303489ac9f0b8b5f4 SHA-1: fae549cfd7b082e6f8d4afc5e3bb96e2fef35609 SHA-256: 7af3a339a45da93d42924c8c5eb99b7638332b53948245603932cb56fbf9ef65
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to disposable hosting, suggests it's designed to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a tactic of using numerous links on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://coretry.ru/uplcv?utm_term=how+to+load+apps+on+firestick
    • http://baocaosudanang24h.com/uploads/image/files/jorunibolivoni.pdf
    • https://hzautomatisering.nl/userfiles/file/86267558752.pdf
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/82437152978.pdf
    • http://4998horo.gmmwireless.com/contents/files/fuvorafoniwoduseladiwux.pdf
    • http://incomsistema.ru/ckfinder/userfiles/files/nakugisujekudegigituzu.pdf
    • https://organicearthfiji.com/documents/file/59274784185.pdf
    • http://2222.netsociality.com/upload/files/nexarewa.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/32127036267.pdf
    • http://thaide.org/userfiles/file/muxipojakazun.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e915a649c1---36666593752.pdf
    • http://yuqiaohome.com/uploads/files/202109161937024175.pdf
    • http://ivankotov.ru/img/lib/file/15269653350.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/berow.pdf
    • https://oancora.com/ckfinder/files/damup.pdf
    • http://glamour-nsk.ru/ckfinder/userfiles/files/wolugabijugavezixekerabar.pdf
    • http://swotaweb.com/img/upload/file/sazibugonu.pdf
    • http://chochosanencino.com/uploads/files/lovunelepotanexilup.pdf
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/18127387472.pdf
    • https://cristalparkhotel.com/ckfinder/userfiles/files/493884321.pdf
    • http://shijijiaming.cn/filespath/files/20210909014925.pdf
    • http://bidadapatidar.com/userfiles/file/lunemegoluvijaboweketo.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161413c6df2ee6---29406177631.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_off0000e374.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE374 16792 bytes
font_01_sfnt_off0000fb86.bin
2e3dd0c765b8ad9a33da3f387b0efa92389c3c45532bedaa12e33ba795631bd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 19440 bytes
font_02_sfnt_off00012dda.bin
98fd3b0d0617eeccc8c91c6d909bf012b946a979f6e459c48d23b5c1cd747e1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDA 10784 bytes

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