Malicious PDF — malware analysis report

Static analysis result for SHA-256 20bf62258e31eab0…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 05:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25db6708d63a33b403c9bb996d2342d1 SHA-1: 784417eeb442ac8ab41fd0341c7c86e0267e9a7a SHA-256: 20bf62258e31eab070218e0f6893e4b25cc8285c001079705f561f2a888c239f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The PDF structure and embedded content suggest it's designed to redirect users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=free+rom+games PDF link annotation
    • http://northcity.rs/slike/files/23498336021.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/84193827209.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///pokuwulopu.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/48176132021.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/72420108737.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/36595451289.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mipipado.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/setakegifuxepixixe.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/ripojuvufamagizorijimawew.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/gawelopowedavuwujekofe.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/58910370588.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/29991213671.pdfIn PDF document text
    • http://kco.su/userfiles/file/67651039994.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/kerukover.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/dewiturotit.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324e9b72a12---zurugojofubunidisulumek.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/nawekefewavukubum.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/samuvifonumamokanaxu.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/98274360359.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/27566295783.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/88902095772.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/saboratobiki.pdfIn PDF document text
    • https://j26clean.com/upload/files/renonuvotatofumefixefo.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/tupizesudoziximizapamu.pdfIn PDF document text
    • http://beijingteye.com/upload/files/49898132629.pdfIn PDF document text
    • 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_off0000d955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 17304 bytes
SHA-256: 75972b37ef6a7b496347f3f88f73f3ad28828e23862ba7df38472c890feccde7
font_02_sfnt_off00011e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4E 10088 bytes
SHA-256: 7dc1c916861d3e44300a0713c1f9974e91a1576a959568ee956a46cd82f19504

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