Malicious PDF — malware analysis report

Static analysis result for SHA-256 b464311fc9a1cf39…

MALICIOUS

PDF

151.7 KB Created: 2021-06-08 15:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 019050aa239204db80896d0608fd4e91 SHA-1: 974e293e5a5b1c53f10e51577a25052717751010 SHA-256: b464311fc9a1cf39093c61ccbd37c8e758bbe46d44c242d174977c474373a531
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 0.9972

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://allytemp.ru/pbw?utm_term=mobile+suit+gundam+extreme+vs+full+boost+ps3+%253B+50+%253B++%253B++%253B+Low+%253B+6 PDF link annotation
    • https://vopuxobud.weebly.com/uploads/1/3/5/9/135974080/jazoduki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419211/normal_605603b35be08.pdfIn PDF document text
    • https://vojufutevale.weebly.com/uploads/1/3/4/5/134521456/2389271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448341/normal_6020c7f6c534a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458631/normal_604810183168b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376087/normal_6057c9c2c0efc.pdfIn PDF document text
    • https://nixuxani.weebly.com/uploads/1/3/4/4/134433038/napixezeka.pdfIn PDF document text
    • https://vudunige.weebly.com/uploads/1/3/5/9/135981242/damavabuwuris.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501045/normal_60404d7b04920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495525/normal_6016ec8899e2d.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4479213/normal_60b6deb6850ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461763/normal_60507e8855435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448341In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/22693c0c-54d7-44c8-ad10-97b724ed1b92/broken_vessels_chords_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcccdb9a-a81b-4b9f-8753-a1e92ea2c8df/how_to_use_python_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d230681-c586-4054-90bd-fe9821638770/66529875482.pdfIn PDF document text
    • http://sofutikajen.pbworks.com/w/file/fetch/144460701/lista_de_comandos_cmd_windows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/697f82ca-2c09-46da-a089-d19ea3aefa9c/megatugi.pdfIn macro / runtime command snippet
    • https://uploads.strikinglycdn.com/files/f41fe7eb-591f-44e4-aeed-342e096a8f92/62544561467.pdfIn PDF document text
    • http://pibadaro.pbworks.com/f/ledibukejivakonijinevulin.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144459849/how_to_download_minecraft_windows_10_edition_for_free_1.16.pdfIn PDF document text
    • http://gulisapil.pbworks.com/w/file/fetch/144420846/silabepeziramut.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF21 81136 bytes
SHA-256: 66dad7353df56e78691b5b513e9d7591c4b9d2c773c9f6e70d0d4532082e31f4
font_01_sfnt_off0001f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F211 6416 bytes
SHA-256: 53418c2ebec910e5f1b57ed08415f2f704d3cc639679a7ce223baca2e37ff378
font_02_sfnt_off000207f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207F5 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_03_sfnt_off00021082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21082 11488 bytes
SHA-256: 1cfbf60ac5b33a94c7a3a01c97ab06bfb1fd6d3a2e10ede53d21df0063f70ab6
font_04_sfnt_off000237fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x237FD 16224 bytes
SHA-256: a5449c452c575443cf93237991a10ddb004431a2faffb6e6cae6bb3aa035dcc9