Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b62fdd5863e003a…

MALICIOUS

PDF

81.5 KB Created: 2021-05-20 23:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 940bf7f60c565f4200a9e3f67d5d32d9 SHA-1: 62e9423f859d070c46886286c526f22d3dcd92c3 SHA-256: 5b62fdd5863e003a381703971ba49c76ec7435f27d3269f225a747430578e122
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to benign-looking PDF files, but one URL, 'https://zajinet.ru/strik?utm_term=ascii+character+table+copy+paste', is flagged as unknown and is likely malicious. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt, possibly using a link farm to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=ascii+character+table+copy+paste
    • https://static.s123-cdn-static.com/uploads/4388620/normal_5fdd5d3fd1708.pdf
    • https://cdn-cms.f-static.net/uploads/4384160/normal_6012de98661db.pdf
    • https://tokinuxo.weebly.com/uploads/1/3/4/8/134848772/7d1f850b.pdf
    • https://demaxezobenila.weebly.com/uploads/1/3/1/8/131856353/vanajowebifos-tesojudilevorir-mimevuxix-pumam.pdf
    • https://xufidevudog.weebly.com/uploads/1/3/4/3/134389214/6607731.pdf
    • https://kumusexowefas.weebly.com/uploads/1/3/2/7/132741352/e985a.pdf
    • https://jobeluraxofedir.weebly.com/uploads/1/3/4/3/134317239/vunuwepujo-vuretevij-putegagupigad.pdf
    • https://rixifumalig.weebly.com/uploads/1/3/1/4/131437092/nitigadab_lufugat_legulo.pdf
    • https://gutazalofekeva.weebly.com/uploads/1/3/5/3/135395177/fofekopizuxu-tanafawabafun-ranuzifujavena-jelav.pdf
    • https://pupewofitesog.weebly.com/uploads/1/3/4/7/134771191/5ef52e5c0.pdf
    • https://cdn-cms.f-static.net/uploads/4388814/normal_603e9e028b518.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pujirageg/gulf_shores_surf_fishing_report_2019.pdf
    • https://s3.amazonaws.com/vatosolikijike/82397021989.pdf
    • https://s3.amazonaws.com/tawosutosuxi/mumikunabosebup.pdf
    • https://uploads.strikinglycdn.com/files/910a60ba-6f50-4f05-ae66-e3ecdf9b14e4/lenovo_g50-30_touchpad_driver_windows_7_32_bit_iso.pdf
    • https://s3.amazonaws.com/kifutizijebuj/13153197312.pdf
    • https://uploads.strikinglycdn.com/files/83fcec4d-5ed1-4aa2-844a-c0e53d016889/85021483977.pdf
    • https://uploads.strikinglycdn.com/files/c5231c23-eaea-4673-b721-94296f855ea7/17481225835.pdf
    • https://uploads.strikinglycdn.com/files/02e686b6-4ea2-45dc-b8e9-eca3653bb742/why_mars_and_venus_collide_read_online.pdf
    • https://s3.amazonaws.com/vunizi/bootstrap_tooltip_template_example.pdf
    • https://uploads.strikinglycdn.com/files/81c4f013-fdb4-47bf-964e-0c8b7de3527d/12401674869.pdf
    • https://uploads.strikinglycdn.com/files/5e52073e-c24f-43e0-917e-53a98857e5a4/was_rise_of_skywalker_that_bad.pdf
    • https://uploads.strikinglycdn.com/files/0a81bc7a-8aa9-4705-8bbf-0c90d4df77f8/67647172177.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a9.bin
d1a203647045aa0bb869314504b0bc0fdf6700064814c83ae980d076a327c893		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A9 5252 bytes
font_01_sfnt_off0000f389.bin
abefd3f7ae0e52217a5b0e150880a53809b35f9e6d10609937777d043d779018		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 26932 bytes

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