Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa9908ead4babd1…

MALICIOUS

PDF

80.6 KB Created: 2021-04-02 08:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8eff49aa0dc26601666a93e3bb5acab SHA-1: 7cd367ba77d710fd5c16a99f3a1a5d2185c82e2b SHA-256: 1fa9908ead4babd11d2b7515e45b8c1432136c93281c356872cba14842b3c458
196 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm and an embedded URI pointing to 'xezojetit.ru', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of a URL disguised as a 'registration deadline' and the 'SE_LOLBIN_RUN_COMMAND' heuristic indicate an attempt to execute commands or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • 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.
  • 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://xezojetit.ru/strik?utm_term=sat+subject+test+register+deadline
    • https://cdn-cms.f-static.net/uploads/4369914/normal_5fe87466dcad4.pdf
    • https://cdn-cms.f-static.net/uploads/4413117/normal_603e86a82e15b.pdf
    • https://cdn.sqhk.co/pesamelez/ixhjgit/regal_cinemas_showtimes_crossgates.pdf
    • https://cdn.sqhk.co/wosipuvetot/Vficie3/26083361485.pdf
    • https://cdn.sqhk.co/retagigimusa/higd4Ll/pobonudiruxid.pdf
    • https://cdn.sqhk.co/gunonutib/gghjggI/fixidajig.pdf
    • https://cdn.sqhk.co/junigofulum/18rkhda/idle_knight_fearless_heroes_mod_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/031cb3bd-a838-45a8-9ec5-ea78cb96004d/hamilton_beach_countertop_rotisserie_convection_toaster_oven_extra-large.pdf
    • https://uploads.strikinglycdn.com/files/a15edb11-e01a-4731-a51a-c086c002a91c/wejavivalevadopenatadop.pdf
    • https://s3.amazonaws.com/lerezazo/financial_reporting_process_narrative.pdf
    • https://s3.amazonaws.com/zebarufuridorur/good_transition_words_for_first_body_paragraph.pdf
    • https://uploads.strikinglycdn.com/files/cca12112-81e8-49d7-a3ab-7779a18839d7/13711146701.pdf
    • https://s3.amazonaws.com/vatosolikijike/windows_powershell_3.0_download_for_windows_7_64_bit.pdf
    • https://43dda2ad-fadc-418c-a2d5-4b96cca2ed60.filesusr.com/ugd/6eca9c_b99f2c6e18fd42bca18e0e94bec14514.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e1366085-54f0-4ff9-9996-b06bec28422d/how_do_i_cite_the_declaration_of_independence_in_mla.pdf
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_38f20a67294d49bab28f63e29058752f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/10e2fda5-701c-4561-ba99-bdf9e6d445c2/what_is_improved_choke_on_a_shotgun.pdf
    • https://uploads.strikinglycdn.com/files/c5531644-de1b-4eb3-968a-8f52af268572/78482447494.pdf
    • https://uploads.strikinglycdn.com/files/2f3da728-0f45-466a-81fc-b397ec67b2a6/31424475236.pdf
    • https://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_55150dae126c47a28e941b5a88cb97ce.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e66b3cba-bdeb-414c-a774-9834ee9c871e/zatezajejuve.pdf
    • https://s3.amazonaws.com/kofabube/28644467725.pdf
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_4e6a11bdc54c4fd7a9a8b3c0a6940a69.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a1.bin
315235e3eae22f6cc358994f1915b44b43c9d28cf83baff9c315077b4faa24b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 5196 bytes
font_01_sfnt_off00010348.bin
8be896f8853dba54cadc6622c3f7f4e73788d8c769e3a31ae573b1f7fa41500f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 10424 bytes
font_02_sfnt_off000126fc.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x126FC 4324 bytes