Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf1f0c8a1bdba29…

MALICIOUS

PDF

152.9 KB Created: 2021-03-14 15:57:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d5b985001258438604e46c172282a393 SHA-1: 11e6904e1088ada2b4097a48b6f658b25d086256 SHA-256: 4bf1f0c8a1bdba292fb8b06bd6150e806d339af05b9f4bc0b339c6876ef0337e
66 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://lozipotod.ru/wix?keyword=marysville+ohio+directions PDF link annotation
    • https://jevixivuxed.weebly.com/uploads/1/3/4/6/134622771/2056702.pdfIn PDF document text
    • http://axecheat6.xyz/mutoxonigawotexasabatiscyyk.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/frm_part_2_schweserkeywy.pdfIn PDF document text
    • http://dinewegivogofe.mygamesonline.org/treasures_grammar_practice_book_grade_5_teacher_s_edition.pdfIn PDF document text
    • http://pasendapp.online/radivedupidetuxozagowibanshlg.pdfIn PDF document text
    • https://dunokosira.weebly.com/uploads/1/3/5/3/135349308/3647750.pdfIn PDF document text
    • http://stalekost.site/autocad_map_3d_2018_tutorialiepm3.pdfIn PDF document text
    • http://cardioactiveuficiale.site/pijosomo3bri.pdfIn PDF document text
    • https://zosujugopaw.weebly.com/uploads/1/3/4/5/134509911/sikim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zitulogakapede.myartsonline.com/xazerox.pdfIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_c465726690464c14ba76f4a17bde71e3.pdf?index=trueIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_37658ccfd6bc4b02bd5971f8903fbd5e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/158eba2e-7653-4247-b2c5-47f007c8fb2b/how_to_cook_a_turkey_in_a_roaster_oven.pdfIn PDF document text
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_1c78900411704477ae7421b9064f21df.pdf?index=trueIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_986bfd56e5e7412495bfc13a322701a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93c33956-912a-4efe-b99a-5100475475ef/is_the_deluxe_drink_package_worth_it_on_royal_caribbean.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21359 4980 bytes
SHA-256: 42baeb9d509989ca46f2e00e3d7498a290baeae0be923e0e842534ca655cc362
font_01_sfnt_off0002244e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2244E 10492 bytes
SHA-256: 5e146c84277a264eabcf122a7959d67d67e19b09789f45cb8f94d4e065355ba0
font_02_sfnt_off00024828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24828 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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