Malicious PDF — malware analysis report

Static analysis result for SHA-256 caccef0833420215…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 23:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6007e7a5997e429f761a6dabe098f54b SHA-1: 55fd1b32f02e844bc253964ffa7c2cb172e20625 SHA-256: caccef0833420215c44298de103218f8275c3acb2564e0c520a68ed4d7a49138
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains, and a heuristic identified it as a link farm. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings suggest an intent to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://inprovitparaguay.com/ckfinder/userfiles/files/81215254165.pdf In PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/geved.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/zutupoxupefixipuza.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/degakuxezibutipu.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/fusovonifedif.pdfIn PDF document text
    • http://splogservice.ru/content/file/61353873387.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/kadidomovu.pdfIn PDF document text
    • http://domario.ru/userfiles/file/63439427107.pdfIn PDF document text
    • http://p-energo.ru/content/file/96972666262.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/38137180598.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/juvazemasavoxod.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/14985931851.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135178151993---66946828829.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210906045153667965.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/xujazew.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/23278754681.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/9567285869.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/satuzig.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/25112331569.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/21841557621.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/dgk40a7nj40lks93mepp78m516/jikavosebefugakixowosedu.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/93065371583.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/78652244907.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/9969678605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+transfer+files+from+iphone+to+pc+using+bluetoothPDF 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_off0000d773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD773 18064 bytes
SHA-256: 103885dfcae5e2f3f71d845e2eb41a28cba818cf2c6c17473cc31aa4ebf1953b
font_01_sfnt_off000105c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C8 11244 bytes
SHA-256: accb9661ed2ab3bb608363fb4494712b68eeb65dc6b8d8568e80b07fbba0ad4a
font_02_sfnt_off00011fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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