Malicious PDF — malware analysis report

Static analysis result for SHA-256 5694b3f73c391705…

MALICIOUS

PDF

91.2 KB Created: 2021-04-06 06:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 260cf755ca858135392e3ee07941deea SHA-1: d6cb9fd123a3d7f1e6dce300732cc319f9f8d241 SHA-256: 5694b3f73c391705c7127eb7112d20f58711b8baf5384c4e0fd92c846b32ec23
126 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links pointing to various external websites, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a link farm, suggesting the primary purpose is to manipulate search engine rankings or to distribute malicious content through these links. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://nipisod.ru/strik?utm_term=where+did+the+angelus+prayer+originate PDF link annotation
    • http://guxiket.iblogger.org/19523888194.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_f392ecda291343b49e4f177226cb3118.pdf?index=trueIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_d1497f458a324be6bddcb2f4bbcec360.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/jugixujivarotedenurev.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_5fb03116e3a14b3587fe9d2912212e25.pdf?index=trueIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_fb72530f5b9944ca871e1143568de477.pdf?index=trueIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_5ce8f017300c44768c17cd0c2aad3fa0.pdf?index=trueIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_80f564f835e9445eada2beffbede3ca5.pdf?index=trueIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_8626952e68f3462d94174b257a94982e.pdf?index=trueIn PDF document text
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_5b84f640ae80432dbd6a775832354f40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizedumi/ff_celeste_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/benny_and_the_jets_sheet_music_free.pdfIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_b73f3e01cc274067ab2a110d3d8a2292.pdf?index=trueIn PDF document text
    • https://eb9d0a7c-f241-4274-9260-18def620c3fd.filesusr.com/ugd/796b85_b9fd622ede1b4b389f326b6261508923.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/dolls_house_free.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/blind_side_full_movie_free.pdfIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_faf590219fb14135b0674a53f9339a3e.pdf?index=trueIn PDF document text
    • http://nalafovop.rf.gd/assembler_des_ensemble_mac.pdfIn PDF document text
    • http://gazadimo.rf.gd/54627685221.pdfIn PDF document text
    • http://gedonoseg.epizy.com/stratos_boat_owners.pdfIn PDF document text
    • https://5b3a2631-baab-4d1f-8161-183aa5bfd7a2.filesusr.com/ugd/5dc2b7_00870f2537d94f9dade04fc6ccdb9688.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_off00012615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12615 5336 bytes
SHA-256: c8076522d747756e955622da639e565de973d1f2d9dd081be5a10df9b58b380d
font_01_sfnt_off0001384d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384D 10944 bytes
SHA-256: ca9ffeb97e12a1840d20d4d097dd1d6d9715a60eea60651238cff812af1e71a0