Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d970443d92b6f17…

MALICIOUS

PDF

83.0 KB Created: 2020-11-13 20:09:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 18caaba5d4d90206ea8e12e317228253 SHA-1: 0913d3c6efc41f8b51be5734e334520e3f83b92e SHA-256: 8d970443d92b6f17d814e9c69b9de1ffe6237edad4e9ad9a680ae1999265abd6
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'linear programming model formulation' to entice users to click on these links, which likely serve to distribute further malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=linear+programming+model+formulation In PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/tolanoku.pdfIn PDF document text
    • https://sadutixonigonu.weebly.com/uploads/1/3/1/4/131412491/xulofoganaxeras.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/rawesaragegugar/13338458673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/205ad8d9-67bb-4042-983e-620e05ef33f2/colorado_post_test_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/free_xbox_live_codes_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a251f171-3f5c-4cce-bb1a-e8f7f59e1f0e/america_the_beautiful_song_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72a28768-178f-4b4a-8c05-5513d1af7e81/jacob_boehme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b139c3a7-c7bb-4a49-87e5-4a26481968ae/rozusupamixusopejanimunam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26250ce0-d913-4716-814c-a19663ce1eb9/15944797257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e895e2aa-c5ed-4358-bc51-6ebc7a45ae7d/jagoteluwutoneme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d54016e-437f-4585-8f92-6ae99414c56e/xojob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cdb3e49-268d-4f62-ad2a-527e0175acb4/gta_liberty_city_stories_psp_downloa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/596bae28-f05a-473d-a11c-5ec371fb36b5/50975778750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0536fdb-6a96-4e75-bd76-cedc68c357c1/final_fantasy_cosplay_male.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cbc0dee-15a5-4236-a3d1-adb5c43bb4ef/minecraft_download_apk_pc.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_off000105f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 5124 bytes
SHA-256: bdbee1a2ba29a9a4fcc62d2025e9ac213ab415bcdb948f22a159b194ca075932
font_01_sfnt_off00011757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11757 12144 bytes
SHA-256: ec1739eacdab27604577ecbac04bfede3ace090f98b6ee702a2c5b6a4922f377

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