Malicious PDF — malware analysis report

Static analysis result for SHA-256 383bb139ef8b3f44…

MALICIOUS

PDF

88.5 KB Created: 2021-03-30 15:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2c9c97cd41815ab5f62edfe1b7f995c8 SHA-1: 8c344f22a045a569c1121dbfb39d97f72fdbe731 SHA-256: 383bb139ef8b3f4425392eb59fb605a9b6b5864521edd8e508e1c19feaa0d655
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/strik?utm_term=free+printable+map+of+the+world+with+countries+labeled PDF link annotation
    • http://raxewaponoxiv.mygamesonline.org/biographical_sketch_sample_for_high_school_students.pdfIn PDF document text
    • http://bilkan.fun/24469779452xmgy1.pdfIn PDF document text
    • http://fruits-summer.fun/necronomicon_the_anunnaki_bible_downloadvjvzw.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/12972917192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_601a4202dfc8e.pdfIn PDF document text
    • https://cdn.sqhk.co/tefupudoma/jfTsURm/music_video_maker_online_open.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxitiwawi/gha4lhh/73881469820.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/braun_thermoscan_3_high_speed_compact_ear_thermometer_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375514/normal_600a68606b0c3.pdfIn PDF document text
    • https://cdn.sqhk.co/fabavukunatu/iibgcjh/ps4_remote_play_apk_2019_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501804/normal_600fa8c4de53c.pdfIn PDF document text
    • http://lokubakodo.getenjoyment.net/affairs_cloud_computer_quiz.pdfIn PDF document text
    • http://rawenspant.online/vixigefikimafobipifijaqb15f.pdfIn PDF document text
    • http://voztrans.ru/star_wars_soundtrack_torrentktw1s.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/Uhf2V3L/driving_process_change.pdfIn PDF document text
    • http://devgame.design/how_many_days_needed_to_learn_english_fluentlyq6z85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bfb79b04-db4d-4c54-a74a-4733ff68ceb9.filesusr.com/ugd/11291b_855b44d905fd4499be011a5152199df2.pdf?index=trueIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_508a73aeee244d71af942185accfe7af.pdf?index=trueIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_9d0287dfac5846e3aceed9478ac09d59.pdf?index=trueIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_2790311fcbb64f9f900434b7098705ab.pdf?index=trueIn PDF document text
    • https://fefcf4f0-bf52-4086-adb3-b788df03f7bd.filesusr.com/ugd/da9d4c_a501d00b4d884027a55660fac5a86e44.pdf?index=trueIn 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_off00011793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11793 5584 bytes
SHA-256: 7b1fb57078304fa9ea775fe2b5b0c4a0f4c43e4e6f576c7b37740041c8a9000d
font_01_sfnt_off00012a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A73 12420 bytes
SHA-256: 2d0c405251af9b4ef0a5a9c42022688798d0061c2a02dcf77973ed70c671190b

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