Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0231b7c944f8f5c…

MALICIOUS

PDF

85.2 KB Created: 2021-03-20 06:07:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2a17ba9f141440681d9a01a40e9d928a SHA-1: 598ae190806d10f9c928b8150f0411849ec6e680 SHA-256: c0231b7c944f8f5c5d57ed5baa79a37563090e4df37509e3efed486308cf7b04
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 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 0.9997

Heuristics 5

  • 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 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://dafemum.ru/award?keyword=bilingual+books+russian+english+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486535/normal_5fd646f80a5e0.pdfIn PDF document text
    • http://babusokojanog.sportsontheweb.net/vofejewetuvenulavipodo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420430/normal_601ee2a7913d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454809/normal_5ff9ddfd54896.pdfIn PDF document text
    • http://nulonelam.66ghz.com/degixepogogubu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387924/normal_5fde2e5503b51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_600e849c5972f.pdfIn PDF document text
    • http://wimuzawoxi.getenjoyment.net/how_much_are_hearing_aids_at_costco.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/notiro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_600b4b6a5b524.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dejogamolefip.rf.gd/gezemipakukisikugirikox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b1bb36-436f-4136-94c4-3d5a104cc768/what_is_a_spell_save_dc_5e.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_be93c45c79124998aa14f7819864513a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ca5a12f-6bae-4c79-9138-550a29b6746f/the_power_of_one_movie_reviews.pdfIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_34ef673b2a334c2dae07270b33a96aa8.pdf?index=trueIn PDF document text
    • http://gorevifero.epizy.com/marvel_comics_movies_list_imdb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24bec183-e62a-44ab-bd34-baae76db91c2/51738615605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a98f62fb-5304-4b11-8dd5-91bb4d6f48c9/technivorm_moccamaster_79212_kbts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f578bf86-841b-488f-9f4d-476a125ac679/midland_wr-120ez_external_antenna.pdfIn PDF document text
    • http://xiniwipilanaju.atwebpages.com/administration_department_functions.pdfIn PDF document text
    • http://faloboxodutak.epizy.com/wodabukofaliwezaju.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_off00010929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10929 5556 bytes
SHA-256: dea50e03562e097c8a93118abf9ac846b28c473096251bd60970b70ac6f63bfa
font_01_sfnt_off00011c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C07 13544 bytes
SHA-256: b2ec1537c74d10b3f91227a22e83527e45dae0b54380a6b1817e76a0a7182da7

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