Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d67e7b88c0ff000…

MALICIOUS

PDF

99.8 KB Created: 2021-04-04 15:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cde8774703f72ad118fbbf931136fb54 SHA-1: 5705df05bba85a8321291fd7176461f241e0359f SHA-256: 0d67e7b88c0ff0003f209872028c9cbb4d12308ab902b95ae5e31d935daa591d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one heuristic specifically identifying a 'PDF link farm'. The primary malicious URL identified is https://jacksth.ru/strik, which is likely used to redirect users to malicious content. No scripts were extracted, but the PDF structure and link farm suggest it's designed to drive traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jacksth.ru/strik?utm_term=utilitech+tm1627l+timer+instructions PDF link annotation
    • http://dabedera.mygamesonline.org/51657758735.pdfIn PDF document text
    • https://velazidolis.weebly.com/uploads/1/3/0/9/130969689/4206143.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/tutorial_autocad_electrical_2015.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/riwifezimaluxolepano.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/bandit_radio_piano.pdfIn PDF document text
    • http://fezanabuxa.22web.org/how_much_is_a_mobile_hotspot_from_verizon.pdfIn PDF document text
    • https://tinuxapesizagi.weebly.com/uploads/1/3/4/4/134440362/4bfaff.pdfIn PDF document text
    • https://gizituxozofu.weebly.com/uploads/1/3/5/3/135303534/gitid-bipove.pdfIn PDF document text
    • http://larokamexi.sportsontheweb.net/enzyme_biocatalysis_principles_and_applications.pdfIn PDF document text
    • http://xalelokepevidon.iblogger.org/cradle_to_cradle_certified_cm_product_standard.pdfIn PDF document text
    • http://fejiximodanu.mygamesonline.org/baseband_and_broadband_topology.pdfIn PDF document text
    • https://sobasoje.weebly.com/uploads/1/3/2/6/132695832/7d951b1226.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/free_bralette_pattern.pdfIn PDF document text
    • http://kujazidi.epizy.com/lowax.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/javofisimitim.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/23846490350.pdfIn PDF document text
    • http://zimopup.myartsonline.com/wd_my_passport_ultra_1tb_ssd.pdfIn PDF document text
    • http://sapifux.epizy.com/63368033219.pdfIn PDF document text
    • http://gaxubamodenev.epizy.com/best_books_for_computer_programming_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/cantico_delle_creature_testo_originale.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/corporate_finance_for_dummies_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/kapuzutisizer.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/hp_elitebook_6930p_charger_price.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14547 5240 bytes
SHA-256: 426883252686f122feef611298469b2391bda220383c59d1d9cc8f8fd7d6f6a2
font_01_sfnt_off000156fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156FC 12540 bytes
SHA-256: de9ca6f6f3e22391b626a10eb89663f68b3310018ed43eaf98912c7a1af63d7a

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