Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f73041324920e15…

MALICIOUS

PDF

156.6 KB Created: 2021-04-27 22:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1a958dabd27d23dbc9c0d17743c46e81 SHA-1: 5f9475399e30c2c2ba01b2681e6663cb2d5359c6 SHA-256: 0f73041324920e1571ccc8c90f424c981512f30b00827dad3a38b2f764ee1793
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://dafemum.ru/strik?utm_term=international+mailing+address+format+spain PDF link annotation
    • http://wusozupu.mypressonline.com/jexuletekuzuxusaduku.pdfIn PDF document text
    • http://rekijiwowak.scienceontheweb.net/wood_adhesives_chemistry_and_technology.pdfIn PDF document text
    • http://vomoliba.scienceontheweb.net/62863569540.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455670/normal_6007bc7251ad3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410204/normal_603811201c25b.pdfIn PDF document text
    • http://fesurowejo.mywebcommunity.org/basildon_hospital_map.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/2255c57c-af0a-4e3f-b2c7-c905b4ad6b6d/59001027641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be6dee9-9b6a-4292-af25-ec7e5960f2e5/does_robert_kiyosaki_have_a_child.pdfIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_ff93bba3ffb64f66be55d9addfef194a.pdf?index=trueIn PDF document text
    • http://rupesujutiwu.myartsonline.com/kulixakobasikekolinukux.pdfIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_51f50a93f4c144ca992a1efcd8b3c9ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/35e0179e-39f7-499a-8093-eef49e402283/fisher_paykel_dishwasher_e20_error.pdfIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_d6304a0c791b45efa212b11809d72a89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ee11b1c-ae47-49ec-80c9-3a26edde1737/when_should_you_use_a_dehumidifier_in_your_basement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21728fae-d53e-4bee-b584-61d152ebac1e/38177913743.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_d2ea2d02cb8a41e9a661ee6a736c626d.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_58e621ead17246f2b835618a6189c748.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/efa2e4e8-19ae-493e-bb0b-9614ec4bf707/jigigitotizunujate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0239a111-d2d3-44b1-968a-5eee73b87375/63786422865.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002105f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2105F 5296 bytes
SHA-256: 62b55fdfcfa2f188c69a1f4afef4fb4486a821f6e4da007f061261eeaa5f975d
font_01_sfnt_off00022252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22252 14120 bytes
SHA-256: c197abb4ec990fc727b3cc3c9a13ae2a61409fc942938b5bff3f20fc9dcc2d8a
font_02_sfnt_off00024ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24EE6 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e