Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83d2edfca41ab5c…

MALICIOUS

PDF

82.5 KB Created: 2021-04-03 19:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 19f769f39496dbc193c5ac9c15d15ab0 SHA-1: 36100f2be08a9bae5941d0bcfe7d5c5533ea25c0 SHA-256: c83d2edfca41ab5ca1bc6fc328293a91bffa18e43b2c41a4b686a3219c5deb36
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://pelibifir.ru/strik?utm_term=why+is+my+nespresso+milk+not+frothing PDF link annotation
    • https://cdn.sqhk.co/nomuzali/jg4fhgc/nuposexagomewilono.pdfIn PDF document text
    • https://cdn.sqhk.co/xowuzaseku/iiBicap/cover_orange_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/ifbHlsY/march_of_empires_guide_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/lelabepena/hidyX8c/x_survive_crafting_and_building_sandbox_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lokovipazal/iczhgjg/waxupafe.pdfIn PDF document text
    • https://cdn.sqhk.co/mofipife/hcQr9PT/42396727561.pdfIn PDF document text
    • https://cdn.sqhk.co/dogilijesiwu/ieja0kw/oceanhorn_switch_gameplay.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_8ee7adb4eed247bea850580a460e754a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a04b0033-e76f-4ce1-a222-41bcdc52ab59/xadixaxireruzuweku.pdfIn PDF document text
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_be5329a0e2424aa88677160b56ec3820.pdf?index=trueIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_7607750dd54a4222bd3b70dc29b1b619.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_8ab608c6bf3543f5b3be0c6d3c20e29b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8c9649-214b-492c-a98a-a0c8984fb071/22860974496.pdfIn PDF document text
    • https://d25e5d79-f3dc-43ab-8538-58f2f4730235.filesusr.com/ugd/898300_4de1d577a5f647d5b195b55c9e00680d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b8a41b-69ea-47e7-9ca0-deaf6e3f5d5c/how_do_i_reset_my_black_comcast_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db4aaa6c-4b13-4f54-a941-068adacbb80e/sinibov.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_9dcfca6ae87745229439a711637d7ccd.pdf?index=trueIn PDF document text
    • https://d9e21584-559d-470c-b0e9-829a80f361fa.filesusr.com/ugd/989f82_d8c946ba248c4489846f3ce202ca39fd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/645f4959-deaf-472a-9284-23ee3506fe6b/85347651025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a398b7b-b11e-47eb-9fc2-fbb84946b95b/is_jack_reacher_available_on_netflix.pdfIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_540f36ccbdb1497bbdb257162e58d282.pdf?index=trueIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_c19e20f70ea94a05be481d7404263e3d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/766e0e31-e7e2-44a6-9eb5-e8209239cbe7/42514728457.pdfIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_3e12e080515b481e9c21053f336fc953.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 5072 bytes
SHA-256: 6af0e86c59e43a534e0de13332e22fd94d5cfeb37dec5d635ca280da0306260b
font_01_sfnt_off0001079f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 11220 bytes
SHA-256: 45163914920ef91bd9d73aff8a0526b2df5e280e98f8da4c6bdc6af8a7fdd5c2
font_02_sfnt_off00012dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC1 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230