Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca70c7f6c83e6717…

MALICIOUS

PDF

77.6 KB Created: 2021-09-20 12:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8e64f0686c7c31b904d7e3ffe4c6f04 SHA-1: ccf61cc6c8004951facd08f652d721a019d7359a SHA-256: ca70c7f6c83e6717afca6207c269bab2eb089bc876e2f1ad86f36957186357b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the PDF is part of a scheme to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://pickup-ws.com/userfiles/files/tijedilobubemegir.pdf
    • https://milorem-service.ru/userfiles/file/wapugajunofufemuf.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404322b1204---76885276633.pdf
    • http://regmac.net/userfiles/files/13581986256.pdf
    • http://ingpiazza.eu/userfiles/files/20988756887.pdf
    • https://aljuboori.com/userfiles/files/66742797180.pdf
    • http://sunrui-ti.com/d/files/nizadoponuped.pdf
    • https://gabinetpro.pl/kosmetyczka/krakow/files/2498644394.pdf
    • http://aromamarketing.md/img/files/90532818867.pdf
    • http://bjyhyy.cn/filespath/files/20210912231216.pdf
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/fipikezudajawive.pdf
    • http://maility.pl/_ADRESuserfiles/file/nutopumolitopabiwuratana.pdf
    • http://rococosofa.com/files/files/dovogujotoza.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/6347592609.pdf
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26519590819.pdf
    • http://elektro-galerie-hamburg.de/userfiles/file/lovolob.pdf
    • http://henghuitong.com/jingkelun/userfiles/files/20210907233748.pdf
    • http://xn--80aer5aza.xn--80aai5amepo3c7b7a.xn--p1ai/ckfinder/userfiles/files/82416615377.pdf
    • http://quimis.org/js/ckfinder/userfiles/files/75887521983.pdf
    • https://eledigitalpr.it/allegati/file/45125449971.pdf
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/52863559876.pdf
    • http://volvo-cars.jp/js/upload/files/punanadizo.pdf
    • http://metroboxservices.com/upload/ckimage/files/saxajuzefotonusoga.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pricing+and+distribution+strategies+pdf
    • http://forum-auto.ru/data/files/kefulalopanarolokow.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_off0000cbe0.bin
ac28609b2c364536c6a8bc0987987eed6929ce2e33e99b13af499deed49b8348		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE0 10992 bytes
font_01_sfnt_off0000e521.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 16792 bytes
font_02_sfnt_off0000fd33.bin
cbcfa36229936c751517ba9f757d2384068747d86aae918b345be4ede7ca0f75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 16716 bytes

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