Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ca77f624ff979d…

MALICIOUS

PDF

73.8 KB Created: 2021-05-23 23:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a8b112d0ca16729f0716812f82a21060 SHA-1: ca2debbcd3f4dcc5be2065d291c64a5ba3ba44f8 SHA-256: 22ca77f624ff979dae63176206bf11e11479f0ed5fc9db51573da3d1fcfda87b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://ponafet.ru/strik?utm_term=introduction+to+matlab+for+engineers+third+edition+william+j.+palm+iii PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369920/normal_5fd3cc827b7d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471240/normal_603559db0107f.pdfIn PDF document text
    • https://zitujizu.weebly.com/uploads/1/3/4/7/134731650/vusibigedi_razotatoxitaba.pdfIn PDF document text
    • https://gukamixi.weebly.com/uploads/1/3/4/0/134042495/sipuvaxedupitugugen.pdfIn PDF document text
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/5576353.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485570/normal_6059b55853256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_603bbfc6489c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487618/normal_60552d6bd554f.pdfIn PDF document text
    • https://jozevupipe.weebly.com/uploads/1/3/5/3/135346753/d66a13f01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_603529bba339b.pdfIn PDF document text
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/mekiligobumu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501991/normal_5febb0cce4661.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/cd5d5aa4-0423-4954-8b02-4d56bde39dbf/timirenodaxipebopis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d4847cd-70d2-4164-b82e-4e24955d8daa/manitikogajit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4720b4bf-da31-4e14-a36d-fa3899ab7859/the_count_of_monte_cristo_1975_full_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f3b4e95-65e0-44b5-94d9-81e7f8d5c0ba/high_resolution_texture_pack_skyrim_special_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c79a1b4-f85e-49a2-a18a-79086a042d7b/mechanical_engineer_salary_per_hour_in_usa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d23c60b2-2f72-4d4f-a8e1-91bfcd9e216b/how_much_does_it_cost_to_install_a_3_ton_hvac_unit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d01a4c4-31f4-4cf7-8644-f65075fc650d/analyse_les_trois_mousquetaires_alexandre_dumas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afa7c8cf-86a1-4158-b443-1a5599bacabf/best_refrigerator_repair_service_near_me.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_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 5844 bytes
SHA-256: 6ea9d7d3785f2cdb08a19a57ce123ab3ea8a11c92d29e25e22db1708e07faea2
font_01_sfnt_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 11044 bytes
SHA-256: 8f5bd100d8b42d53f887f609a3ff560ca438093ebbd7814d1b76d496e82c2e8a

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