Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6266d7bb4709db…

MALICIOUS

PDF

72.0 KB Created: 2021-03-24 22:24:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b95fae9b28ba9afebe7c7187eba0fef7 SHA-1: c068dcdc39bd3b26f3bb326dfbc06750e9c22546 SHA-256: 8e6266d7bb4709db02eb4d6c3d5e893c793e48d6b0102bfcd652af0d47737cd1
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. 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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://fokemale.ru/strik?utm_term=difference+folk+and+popular+culture PDF link annotation
    • https://gideturifit.weebly.com/uploads/1/3/4/8/134887905/lanavuzilowo_jazol_lazufewodokowiz_filujapudimip.pdfIn PDF document text
    • https://votetofovuwov.weebly.com/uploads/1/3/4/9/134901863/gozajuwaxolupiv.pdfIn PDF document text
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/gexuxosomoxamif-napuboveda-weluxiwi.pdfIn PDF document text
    • https://jositaloj.weebly.com/uploads/1/3/4/0/134042718/452b674c3.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/tuxutedi/instructor_s_guide_template.pdfIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_548807aeb6e54e86b3bd2c5ba1306b78.pdf?index=trueIn PDF document text
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_4435dad572e74f9692731bbcb1803839.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b6788d-778b-4495-9601-722a120852f7/how_to_cite_words_from_dictionary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76edeb24-3857-41da-9341-ee306e76670b/dark_souls_curl_up_like_a_ball.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/11088755373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03195e33-553f-45ad-8539-17aa72fb94b7/other_phrase_for_rabbit_hole.pdfIn macro / runtime command snippet
    • https://uploads.strikinglycdn.com/files/67707cd5-c5ce-402d-8ef1-b60131036afd/17985516596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25807a06-a76e-4e72-80b9-a5ad36a6c15b/how_much_does_an_engineering_manager_make_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b75c23ed-39f2-4ef0-b333-a08fc23610c7/the_book_thief_sparknotes_part_1.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_00daa833529642d39461a6d0bbab5e99.pdf?index=trueIn PDF document text
    • https://5121d360-3808-4f61-aa44-d87cf2d9d428.filesusr.com/ugd/032e8a_012790885b6f471eba5e71bfb75a4c8e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tawovojo/lutadanujoxidutumebevis.pdfIn PDF document text
    • https://c79dcb07-c1b1-4d84-a600-6417d8bf0f54.filesusr.com/ugd/edce22_0caef2984bb24774b6c5db7ab028d228.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
    • https://s3.amazonaws.com/jikopot/110In macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDE 5036 bytes
SHA-256: 7c2ad95759d915ebd28ad692a3db4f274744bf4d6059bcc082b968c1bf2fb1c4
font_01_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 10504 bytes
SHA-256: d002b05c3f6f0794f77527a3c3a1743a019565e5ac5e7f8103c2682adc28a451