Malicious PDF — malware analysis report

Static analysis result for SHA-256 149be3985c5c1b74…

MALICIOUS

PDF

78.3 KB Created: 2021-05-08 16:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7f849a8a50490386b5eb8a9a8f8695e7 SHA-1: add43729dce50647ecd54f508227173d6c6cd7fc SHA-256: 149be3985c5c1b74e536d6989440ec80a9710b569b5e8e5040e8d25609da2f12
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lozipotod.ru/strik?utm_term=what+does+607+mean+in+text PDF link annotation
    • http://zibikudupe.mywebcommunity.org/pojotalumowupidifuz.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinipaz/DgfoVNe/konirej.pdfIn PDF document text
    • http://lifelalulenomip.mygamesonline.org/bugaboo_cameleon_3_instructions.pdfIn PDF document text
    • http://maxoranano.sportsontheweb.net/download_to_excel_converter_offline.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/Ljgjjib/wizimupikovusip.pdfIn PDF document text
    • https://cdn.sqhk.co/wevujawej/iag4jj1/rally_fury_extreme_racing_for_pc.pdfIn PDF document text
    • https://kadezejuvi.weebly.com/uploads/1/3/4/6/134603763/degojugurodenigojaw.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzujugasije/kXqj7GV/adding_and_subtracting_fractions_mixed_practice_worksheets.pdfIn PDF document text
    • https://manasuxejorodi.weebly.com/uploads/1/3/1/6/131606962/ed506.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/gghdjjm/kejem.pdfIn PDF document text
    • https://salovunuwav.weebly.com/uploads/1/3/0/9/130969923/dobezetusixe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_001164bc3e574a5b8cb5916a66a801b8.pdf?index=trueIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_0dd9b9c8c53545c69e0acaeb170d8533.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_43779bc318eb42f1a4dcf0473c98a3c3.pdf?index=trueIn PDF document text
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_6931a8c426f54248bf7155e3c21d1349.pdf?index=trueIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_4c802b49c633432380c70638a4c9b4a2.pdf?index=trueIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_d85c501630fe4a16b4b69446bcb55a81.pdf?index=trueIn PDF document text
    • http://rujidafedisezu.atwebpages.com/vobefunofetarewupapovonu.pdfIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_19e0eb797cff4dffa83bd985e2cbf8b7.pdf?index=trueIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_400ba10479ed4b2399b162cbe97c5f4e.pdf?index=trueIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_37156814853f4456a03fa3fd5da4d0be.pdf?index=trueIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_d6824acf2e2e41caa216aab7bc2ce0a5.pdf?index=trueIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_6a7899cd9e82422fbf9feb85f3702b1a.pdf?index=trueIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_0287dc79a37c45309dcdfe03a7c4a343.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 5392 bytes
SHA-256: 5e01b76b97fc062aee5a56869185e820aea39ce0688aaea67dae284d77c87083
font_01_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 11408 bytes
SHA-256: 552a5f57944519167fef288b643992ef1712d600f8ea97a4e700890c4b62da82