Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ddc9f75c5328577…

MALICIOUS

PDF

85.0 KB Created: 2021-06-03 20:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2c0c1e49c41997996b83d91eba6a126e SHA-1: dd8d04391e74b2ba73cf8533daa9aa3a573704e6 SHA-256: 0ddc9f75c5328577b50056ef8ab4d4cc87bd4e8a6e1b6e5eec3e7754826e0b48
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 0.9991

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://allytemp.ru/pbw?utm_term=english+vocabulary+in+use+pre-intermediate+and+intermediate+level+test+with+answer+key PDF link annotation
    • https://nibowivuxewanu.weebly.com/uploads/1/3/1/3/131379040/e54c1afb80f.pdfIn PDF document text
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/nuzajiliw.pdfIn PDF document text
    • https://bunogijadijis.weebly.com/uploads/1/3/4/8/134896562/siwutalumowoj_dimirozegawobe.pdfIn PDF document text
    • https://kekorozonositen.weebly.com/uploads/1/3/2/7/132710750/magapajarajamigub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366632/normal_5fc9217d705d9.pdfIn PDF document text
    • https://nazixusa.weebly.com/uploads/1/3/4/3/134363102/durilejabegalawuz.pdfIn PDF document text
    • https://gifitutopa.weebly.com/uploads/1/3/4/4/134470147/barex-girikopixajemuf-bojufesurox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482216/normal_605951174ca53.pdfIn PDF document text
    • https://setowunujabid.weebly.com/uploads/1/3/4/0/134095848/sibadafuporipukigo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xorunezagu.pbworks.com/w/file/fetch/144438651/mothers_day_handprint_poem_printables.pdfIn PDF document text
    • http://marutipug.pbworks.com/w/file/fetch/144429090/1383904185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d0c6707-f681-4490-9fb8-ecc92acaae00/how_to_spot_the_mysterious_stranger_in_fallout_shelter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96ab72fb-8555-421a-9820-a442f07bef44/introduction_to_analysis_gaughan_5th_edition_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b9b3be4-425f-45d0-888e-cc56950eaf46/kagepugozisusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e9f9eb-536c-4de1-9c4a-eb1d8160c653/32152468101.pdfIn PDF document text
    • http://wurutaw.pbworks.com/f/pimogesazezidub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3cd797d-43ec-4714-987a-e98cd8ab7f59/tulevunudatedap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3149a6f0-5cbe-457a-a9e4-66b81d86d523/60450173737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/096410f3-a875-4868-b519-8f7011785278/how_do_you_reset_comcast_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b33c9e72-b4e5-4ee1-8408-10d41127e841/bolt_action_rules_quick_reference_sheet.pdfIn PDF document text
    • http://negaboxa.pbworks.com/f/how_to_own_a_nandos_franchise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd12b33-68d2-4d6f-99cc-87a0a4378276/1619202234.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 3572 bytes
SHA-256: 725e596589b14c90c5fa1756091dd6c17d6f0e7679743403576c9ef4a6dbca7e
font_01_sfnt_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 5936 bytes
SHA-256: ff1c4262eda30c831f73b60ec007f5da8997d40a754404aae24fa6d3f573e0ef
font_02_sfnt_off0001016a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016A 15600 bytes
SHA-256: 1f1e77e1a8bd5c7df6691d3b92b9831ecdaaf0c6ac26329b8ca3588f2eec7d44
font_03_sfnt_off00012d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D13 16676 bytes
SHA-256: 0cc5b8ea071eb99a38aba2bc501924c40de4f6414d428381a3b219c2a9c3ba24

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