Malicious PDF — malware analysis report

Static analysis result for SHA-256 93151f131076661d…

MALICIOUS

PDF

102.5 KB Created: 2021-09-23 23:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b542a6b414f8df3bab910d20cae3805a SHA-1: 550e0e3c6ff7a376fe8d78d2e999ffc72427e53a SHA-256: 93151f131076661d4aba798c297763ca11457cf1082500fb259146522f122d76
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://vinniescustoms.com/userfiles/files/banezumizawe.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463777c6c79---rusotobivekexalunupi.pdf
    • https://a-guskov.ru/uploads/files/87895064180.pdf
    • http://www.rify.us/cms-uploads/files/rojitikobibenaki.pdf
    • http://galettedesrois.hu/userfiles/file/jutimenuma.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142dfdd695ad---zavatelagedes.pdf
    • http://vecsecity.info/editor_up/41306083646.pdf
    • https://projekt-lesen.de/userfiles/file/movurawawerofunodopuka.pdf
    • http://klhl.com/userfiles/file/wedutaxidi.pdf
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/nanitesodiwepe.pdf
    • http://artdealer.vn/upload/fckimagesfile/ca253958cadc6b974f2a966e48563397.pdf
    • http://zit-tech.com/userfiles/files/ranag.pdf
    • http://lindendirect.com/ckfinder/userfiles/files/86254293447.pdf
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/24220148031.pdf
    • http://shiinamotors.com/js/upload/files/wuteguwabosijaza.pdf
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/25656561655.pdf
    • http://hardiebase.com/uploads/assets/filefile/63721631259.pdf
    • http://cafegreenwichvillage.com/uploads/files/75560310567.pdf
    • https://www.thaiahpa.com/flash/files/89386974574.pdf
    • http://konemara.hu/userfiles/file/18955609809.pdf
    • http://boldogelet.hu/media/15223302114.pdf
    • http://beveragesgs.com/userfiles/file/42054811307.pdf
    • http://bk-plus.at/userfiles/files/74028988533.pdf
    • https://polenhosting.com/calisma2/files/uploads/76937060770.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/60928990419.pdf
    • https://dp-silver.com/userfiles/file/60879100770.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=minicraft+free+apk+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_off00012d79.bin
7badbb0f89283bcbbbc16c7ff56b3fd86ffe84e6366c39149b671f3810d41e01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D79 17740 bytes
font_01_sfnt_off00015b6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B6B 16792 bytes
font_02_sfnt_off00017382.bin
edd23e08897dfd5e94f459d0cf914eadf6ed5e841336b3780ab88bb5deadd89d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17382 10616 bytes

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