Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbea763b67da018b…

MALICIOUS

PDF

70.9 KB Created: 2021-04-14 22:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4713eb19007ee631dd49420cf77d3ae4 SHA-1: 2b92eb97631b11f37a72a6b67bcf1f842fc423f7 SHA-256: dbea763b67da018bf6dff59bea881d20a55e9239180abcea6c7fcfcb56b66dc5
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a high number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The heuristic 'SE_LOLBIN_RUN_COMMAND' firing with 'curl watch strap' suggests an attempt to disguise or execute commands. The ML classifier strongly flags this PDF as malicious, and the presence of numerous external URIs supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://kuzutuzo.ru/strik?utm_term=rip+curl+watch+strap PDF link annotation
    • https://tekigeja.weebly.com/uploads/1/3/1/3/131384442/jiliwunujojas.pdfIn macro / runtime command snippet
    • http://fisitupogavi.mypressonline.com/80873392918.pdfIn PDF document text
    • https://giravegide.weebly.com/uploads/1/3/2/6/132681237/xokoluperofekef-kiboxuteri-xizipitobab.pdfIn PDF document text
    • https://pidorisegis.weebly.com/uploads/1/3/4/7/134761928/vosububesiki.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/34362819103.pdfIn PDF document text
    • https://rofibefis.weebly.com/uploads/1/3/4/1/134131293/e1db249f26b823.pdfIn PDF document text
    • https://dakuwiremab.weebly.com/uploads/1/3/4/9/134901294/31821.pdfIn PDF document text
    • https://pogizufibedisiw.weebly.com/uploads/1/3/1/6/131606284/d304a79096d.pdfIn PDF document text
    • https://kewivuzakokefi.weebly.com/uploads/1/3/0/7/130775129/8492489.pdfIn PDF document text
    • https://fegemuvu.weebly.com/uploads/1/3/2/6/132695633/123580.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9d39fe3-d1d4-491f-aa79-6b13c8b1cdce/what_does_a_dream_about_being_pregnant_with_twins_mean.pdfIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_7f3690e7416647aba5a2743f9fc419fc.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_5fc9eff4c10e43fc8759acf734f6a490.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/xujatesam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42b7fe08-fd7f-4fad-8bb8-38bdf75e251e/xitepavaxarow.pdfIn PDF document text
    • https://451cdc1f-766e-44a1-8a9d-f9db2ecad5ed.filesusr.com/ugd/0f0d48_f7d66b1e466f4a6cbbaebf7c16e38af1.pdf?index=trueIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_ca596fa223874d528dfd4b9e20318a31.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb0511a-4a07-4170-bab8-420f5a93250b/obra_don_juan_tenorio_personajes.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/letter_k_worksheets_cut_and_paste.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/xopozuvuronewabiroj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e13a20b-1aa7-4181-9105-a42d4b2d6250/pivebate.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_off0000d8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 5120 bytes
SHA-256: 7988920409e5ffc8db4658e8b7658f51cad0194dc920371945d9d04ac4ecf23d
font_01_sfnt_off0000ea60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 10472 bytes
SHA-256: f1c4a27ee3d284932dcb803ef61c97c1dc8bfc8e90ab5a72ebc30186898e386a

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