Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9bef0f317733d1…

MALICIOUS

PDF

76.7 KB Created: 2021-06-10 16:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: af0dd77497c986230ae0455309ac0128 SHA-1: b29941a0db48aa85f53da1d150ecbd9ae42d0cbb SHA-256: 0b9bef0f317733d1bf7ae9617bdc1fe3d4eadfe585fcada33d706145bf721760
186 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 ClamAV and 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=imagine+dragons+believer+live+mp4 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388611/normal_5fe32070d03df.pdfIn PDF document text
    • https://gipurafesab.weebly.com/uploads/1/3/1/6/131637457/rufagevarigewig.pdfIn PDF document text
    • https://guzesunidami.weebly.com/uploads/1/3/0/8/130873942/0f1ce9b8612865f.pdfIn PDF document text
    • https://rewumakabaw.weebly.com/uploads/1/3/4/8/134856880/zapezabat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487903/normal_60b9cd9df290c.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://sozevupegufi.pbworks.com/f/14805837266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ededecac-fa68-4ce4-835a-03c52e42a8b9/logitech_k400_plus_treiber_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd92dd9-8926-4d40-b507-96435e7f475e/30583111730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e300fed-bde3-4d7c-9512-40d87bd32c48/tratado_segundo_lazarillo_de_tormes_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4554f45-a2ca-403f-af0a-95afdca3e819/how_to_fix_dyson_pulsing_problem.pdfIn PDF document text
    • http://bomasasawavi.pbworks.com/f/68769388189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ace67cc3-bd9c-4c9d-8971-f47bc84fca2b/price_braun_series_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a965ed1e-b510-44dc-88ff-f080c5fafb9b/beboncool_switch_controller_instructions.pdfIn PDF document text
    • http://jamexapageku.pbworks.com/f/squares_and_square_roots_class_8_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c5a8912-1b06-44d5-9292-cc38ca1691f9/julamawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05f080cb-4527-4a27-abee-96cb66e3b54f/36542076705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c5499a-7ca2-429e-aa36-fe6daeb87ea1/how_to_reset_maintenance_required_light_on_2003_honda_civic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da4117d7-9f30-47b4-8267-de81429caa48/zombie_hunter_king_cheat_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eedfd790-05ec-4ed5-9aa6-ff13018e4cf8/80958841452.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_off0000cafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFD 5212 bytes
SHA-256: 8b3fd617ef0dcad5434b6b61ff35c905605162c2bc77d4763a76580741992a50
font_01_sfnt_off0000dc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8C 10676 bytes
SHA-256: b62bb3a2328d546bd8cae39ae25b490c3d98e8208f2deb7926666b7868de3444
font_02_sfnt_off00010038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10038 16508 bytes
SHA-256: de605362f6fb4f0eb5e5be4adee32c48c65986f43d44b8d804156916f624e967
font_03_sfnt_off000116a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A0 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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