Malicious PDF — malware analysis report

Static analysis result for SHA-256 f690b9cfe850acb4…

MALICIOUS

PDF

75.9 KB Created: 2021-03-28 08:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e849db906906dc87a715c5a3d412545f SHA-1: b1bf18d580b5f79af504aa308dde890ecded180c SHA-256: f690b9cfe850acb4e7491748e8bf67473a76de7da76e1ce2df87c8d0144371e5
96 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 0.9995

Heuristics 4

  • 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.
  • 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://dafemum.ru/123?utm_term=guide+to+grasses+of+southern+africa+pdf PDF link annotation
    • http://topukovatawosu.sportsontheweb.net/arithmetic_sequence_and_series_formulas.pdfIn PDF document text
    • http://kaxiwemusemoj.mypressonline.com/the_book_thief_questions_and_answers.pdfIn PDF document text
    • https://sebuvijanamo.weebly.com/uploads/1/3/4/8/134856810/3495693.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/xutadojoxigaretenuduj.pdfIn PDF document text
    • https://kujibolivobukib.weebly.com/uploads/1/3/1/1/131163991/xawufonodonim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/wulifukupavalagu.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_c1d5c5febd33469699b1b5536dd1bb14.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eccfd0b1-d031-4399-8417-6a82d026256e/5317127884.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/what_does_service_due_soon_mean.pdfIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_5dea3dd3fd334814be56b593ababf588.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/what_does_flex_fuel_mean_on_a_chevy_impala.pdfIn PDF document text
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_59d8db3a4d3b44f98bfd86f3a7a7d04c.pdf?index=trueIn PDF document text
    • http://badamowafe.onlinewebshop.net/99629797721.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/polygon_worksheets_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/kavebanidujoralepododom.pdfIn PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_647c57d80aaa4f9baf1bb3e9b91debd7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/424490ca-3e7e-4b6c-953a-11312cdec4c1/sony_xplod_car_stereo_52wx4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86f9076c-1da6-4a71-8e7c-bbfeccb493a4/how_to_set_stopwatch_in_fastrack_reflex_2.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cab8bac-e13e-4f41-8b81-6415343aa3de/beginner_easy_crochet_granny_square_pattern.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d842096-1b36-47c1-98b9-a1834e9694ea/does_google_classroom_have_live_video_chat.pdfIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_9a2d1bd7dbd744f2b52e1000aaf3691c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fikuvine/zojolurebobufabi.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_off0000e87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 5416 bytes
SHA-256: a5fa19281c9e7e85ac0ecc4c638250ea25c1d519fe7919c137b31c8b0ac286d6
font_01_sfnt_off0000faed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAED 10960 bytes
SHA-256: 7c1666fffdba9e8a7220863446f25459c2b90beeb8ed2f4f0b76fa3905634169

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