Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4c23d86a1693f4…

MALICIOUS

PDF

96.9 KB Created: 2021-04-23 20:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8ac675d98576c406aa1d7b957ba8f9f4 SHA-1: 48bc544da4b89bc7c3b9f5fdce68701bfce88ebb SHA-256: 0d4c23d86a1693f4a21a0f636a56cc6a58c7e0cf528bf772759fe08a7bacc487
126 Risk Score

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 0.9996

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://maypoin.ru/strik?utm_term=why+does+my+dyson+cordless+vacuum+keep+stopping+and+starting PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501963/normal_601e422df1ae7.pdfIn PDF document text
    • http://lowufadit.scienceontheweb.net/79089148505.pdfIn PDF document text
    • http://kifejuja.medianewsonline.com/fulafurepivowonigoru.pdfIn PDF document text
    • http://www19216801.site/32499597164ae5uc.pdfIn PDF document text
    • http://jipetabonitu.mywebcommunity.org/complete_javascript_tutorial_for_beginners_with_examples.pdfIn PDF document text
    • http://xanusojuruxu.sportsontheweb.net/alat_tes_cfit.pdfIn PDF document text
    • http://kejumazinanu.mywebcommunity.org/25816102032.pdfIn PDF document text
    • http://samozanyat.info/bose_soundbar_300_subwoofer_manuali8qsy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407804/normal_5fd78327b4f41.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd1bf2a2-ac73-48f0-ade6-3da34c365ab4/nefobibugevabup.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/marvel_comic_page_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb6615ab-b59b-4908-bbf9-e603dd7d9446/another_way_to_say_great_place_to_work.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/mirrorlink_carplay_android_auto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d615559-dd73-4a79-87ca-6f140ffebc14/84970336210.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/lujepatizamekogugememut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd10ef8-09c8-4d10-ac34-c8931ee7cab3/kindle_4_not_charging.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd60dcfa-2c08-4ad9-820f-3693e8217504/movies_like_history_of_the_world_part_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f9828e0-ee9e-450e-aedc-4554ca72aa02/how_much_propane_does_a_rinnai_heater_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec1ab071-e9e5-45f4-9e1d-b689bd7e9aa8/the_new_encyclopedia_of_modern_bodybuilding_hardcover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1049ada-f34b-4abc-aea0-9d44a512325b/justin_bieber_shawn_mendes_-_monster_live_on_amas_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/rrb_ntpc_2015_notification_sarkari_result.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D81 5724 bytes
SHA-256: 9c2d9f97781604344056cf54b500c8705416ca449ab5458a041ac23eee762580
font_01_sfnt_off000130f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F1 12248 bytes
SHA-256: bde9504c4838f2abf1465b9b206fe6b1d8f69fb3bcfb3c206668dcfe86aa209e
font_02_sfnt_off00015969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15969 18052 bytes
SHA-256: 3be4c5e168a169241eab20b5fe1bdee02b3a2e0a9189e515db9aa8a510d0f099