Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f639be7facab056…

MALICIOUS

PDF

79.9 KB Created: 2021-04-06 06:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e0ac40a49f33235810f76926a5e93aee SHA-1: bcffce941046b2b30e9984ed61b6dbc7ede80126 SHA-256: 2f639be7facab056e0712ccdcf93ad54a0d217aa86ff22917f0ce17a4afdd93b
124 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The primary malicious URL identified is https://nipisod.ru/strik?utm_term=where+did+the+angelus+prayer+originate. While no scripts were directly extracted, the PDF structure and extensive linking suggest an attempt to manipulate search engine results or distribute further malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9458

Heuristics 4

  • 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
  • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

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

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