Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3dccf395549b8c…

MALICIOUS

PDF

76.6 KB Created: 2021-09-14 06:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c1ed01e02af822701158c1a94ecd2575 SHA-1: 7aa6037d9190a12481eb11c8c68a81df8733fbb6 SHA-256: 2a3dccf395549b8c0b956296cb0c7bc517967f7ce5de786bb224e755268237e6
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to disposable hosting and form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://allier.proximeo.com/ckfinder/userfiles/files/169666662.pdf In PDF document text
    • https://makanbanyak.net/contents/files/delemabosu.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/92088126275.pdfIn PDF document text
    • https://vzglavniki.net/data/file/tifiloxevatemanitela.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/vekonedon.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/weliko.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/d2id089t2tc8jj1ntid389tbcl/57335026679.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/giwilijiwezaxokadip.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/fuwejuruvafunukirusav.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090915154573499.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/29923322358.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/66329366689.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/14207323047.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/56546711011.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fde03d0f26---24540003840.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/60629135683.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/5483747237.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/66291125923.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/jaramod.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/46941479464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=grid+autosport+android+apk+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97C 10572 bytes
SHA-256: 2f7add7c1363310e98a2df5de05be54666f8082edab7a90972d69c116f37d780
font_01_sfnt_off0000e1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 16852 bytes
SHA-256: d25e6ae65244fbead5b8cb52f1fc7aa156db44365eb82389e40d53785419fccc

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