Malicious PDF — malware analysis report

Static analysis result for SHA-256 0189c7e3fd210c1b…

MALICIOUS

PDF

75.8 KB Created: 2021-03-18 11:47:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4e64efdb1ad2722d51f1f3da1f3a6e13 SHA-1: a8436da3ff28548d980cdc7fb080e3d48a45fdf7 SHA-256: 0189c7e3fd210c1b035ee32f1f3ce061ab4951d57953080c0b574f05f97fc04d
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/award?keyword=example+of+rationale+in+research+paper+pdf PDF link annotation
    • http://gramnews.xyz/ditesagidelasizerosoj5ud3n.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/jFCicgd/23464951761.pdfIn PDF document text
    • http://heliusdesign.ru/401581535088g341.pdfIn PDF document text
    • http://limons.space/volume_of_a_cone_worksheet_grade_8k4hvk.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/gePPEG5/gali_chirugali_telugu_video_song.pdfIn PDF document text
    • http://bluebadgeform.com/telecharger_bouteflika_une_imposture_algrienne_gratuiteves8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wewiro/auction_donation_form_template.pdfIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_71570133cd184833b70825968738d47e.pdf?index=trueIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_5cf40a459a484a188a2a494282f910e0.pdf?index=trueIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_0fb5a543b4c04a15b00484b25af41175.pdf?index=trueIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_08ebb542636a452c992f72e7187081ea.pdf?index=trueIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_d229803fd5cf4f72a99cd427d4cce531.pdf?index=trueIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_2dbc66682b444568843343e13b5059e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lerezazo/98486285237.pdfIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_704876b8981647a4828a3636bcd79b54.pdf?index=trueIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_f4c5967b8c6a4389b54bfa95d585b330.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/fezotibenoxasafejuvexuja.pdfIn PDF document text
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_5797fdc87a884eb98ffae90c00b18e98.pdf?index=trueIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_ba4f771d83e446dca597a6e1a62bd7cd.pdf?index=trueIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_48519de78ecf45a8bca45144e8c7002b.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_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 5420 bytes
SHA-256: d5d6ffa35766d71422366c2f5cdd8d4e512466199127d0881c50c579ce9a3be9
font_01_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 10600 bytes
SHA-256: 9df054edf2e3eb22439b3d18e7c8a9801b78a1e0f7c7707c0109216264867981