Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e5f92d8cfde477…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 18:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3875b9f663942d12d7db5bda34ae9693 SHA-1: 05ce02042e9ba7c2f1d3fbd1ce9d8ed7976b84e2 SHA-256: 49e5f92d8cfde477df8eb7e3c2e39f913cb57ec50a5ab2654c1720a114fe1aa7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://armagedonspedycja.pl/files/file/zawevalebatowofisugokewox.pdf In PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/12230502338.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/5756933181.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/tidibarurizopazi.pdfIn PDF document text
    • https://ratosatu.com/contents/files/82594659990.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/talugoxosimeguro.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/zubuponij.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/4879af2ae726b3a4bd898ec6592ac8e9/rugozitutodug.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/6823109191.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/54498145995.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/zifutagikizu.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/95033851221.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/magusosumizejexov.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/17435176852.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/varufomabi.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/kupokux.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/sutixowudezawi.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/vawajuferiperamomagudofug.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/fefinagivapudidosipa.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613deb288d50e---forutezinitog.pdfIn PDF document text
    • http://meta-min.com/files/gerezewe.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/99978212936.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/davisuwoxukesuxun.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/72933108285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=thop+tv+fire+tvPDF 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_off0000d566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD566 18332 bytes
SHA-256: 723836eca06367c2fe9effae09f2c8a651137e34884dd9e6c8f8b65a5f63df7b
font_01_sfnt_off00010535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4C 10004 bytes
SHA-256: 1baaab9a7cbc769333c3fe2866f1ca28ecb323f4e4bc616a4b1a5590e1e0bd2f