Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85389052cc4f4c7…

MALICIOUS

PDF

93.8 KB Created: 2021-05-29 18:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8975ba7d34bcb18b058bd982e8eae13b SHA-1: d6aad8f4b648da3d91fa5f63d1e0d8967a1776bc SHA-256: b85389052cc4f4c7409516f9eaf5e043b63770383a12cfdd1c1ba44e30312307
126 Risk Score

Malware Insights

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

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 0.9992

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://jacksth.ru/123?utm_term=colorlib+free+templates+admin+panel PDF link annotation
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/wogapoz-vejepo-fawesowagujiw-witufoduvegipi.pdfIn PDF document text
    • https://gidigodojuk.weebly.com/uploads/1/3/0/8/130874472/3803739.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453337/normal_60348923739a0.pdfIn PDF document text
    • https://lemevepavakupe.weebly.com/uploads/1/3/4/7/134701524/b1fe44.pdfIn PDF document text
    • https://gixebufenof.weebly.com/uploads/1/3/6/0/136082423/dubizogumiguvuboj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485172/normal_606b0af5b2da8.pdfIn PDF document text
    • https://waneratamif.weebly.com/uploads/1/3/1/4/131436972/vugelurij-rezopeloxo.pdfIn PDF document text
    • https://kepofubegitonez.weebly.com/uploads/1/3/5/3/135306487/fimisibapizen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459319/normal_5fde8b90016e2.pdfIn PDF document text
    • https://fokididekorup.weebly.com/uploads/1/3/0/7/130775810/feser.pdfIn PDF document text
    • https://jirorenuges.weebly.com/uploads/1/3/0/8/130874518/1639348.pdfIn PDF document text
    • https://tufobedix.weebly.com/uploads/1/3/4/4/134431979/326134.pdfIn PDF document text
    • https://nisewoji.weebly.com/uploads/1/3/4/2/134266574/dijudevarop.pdfIn PDF document text
    • https://nulobivamil.weebly.com/uploads/1/3/4/3/134374027/tivone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485321/normal_606a90c5984d3.pdfIn PDF document text
    • https://pomujitumigo.weebly.com/uploads/1/3/1/8/131857402/wavidomamana.pdfIn PDF document text
    • https://texoxarisozitew.weebly.com/uploads/1/3/0/9/130969357/wusagexowo_punufek_kakof.pdfIn PDF document text
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/7359191d89.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/55e6df6.pdfIn PDF document text
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/wijubipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477173/normal_6031cad3e2afa.pdfIn PDF document text
    • https://banodita.weebly.com/uploads/1/3/4/3/134311275/a2b4e39490.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/ac1bc01c-78a0-46fa-83f2-dddf1ec28f66/50323012983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b57ed17e-0a3e-43d1-b95a-7177bce6ceff/the_childrens_hour_movie_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f602c97-1078-4236-abc0-bb065394657c/how_to_determine_molecular_structure.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CD 5232 bytes
SHA-256: c7012f94023b41d0e46d54ce37c2e4ef193b2a26208a95f8c4a9a0ea8bafe115
font_01_sfnt_off00014470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14470 10844 bytes
SHA-256: ba899d3c8c01a06a3def9cf2eb028d8d1ccebc84b0d5bc4975eaf073ea21abcc