Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4bb0aae888f674…

MALICIOUS

PDF

73.9 KB Created: 2021-01-30 05:47:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c7cec114336683a049358f1bae5c15f7 SHA-1: 987252c2efa1d3637f447550093f45f3901d0828 SHA-256: 2a4bb0aae888f674515a1cf5d253f5a032e0890b452d0225d24b12fc69bd59e3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable hosting and using UTM parameters, indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/aws?utm_term=adjective+worksheet+year+2 PDF link annotation
    • https://cdn.sqhk.co/wobuwaseja/1Zha2ii/galaxy_watch_2.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/WoheNjg/super_sonic_the_hedgehog_full_movie_2020.pdfIn PDF document text
    • http://midorezif.iblogger.org/vba_copy_dynamic_range_to_another_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/fsRjagj/hachi_hachi_ashdown_arkansas.pdfIn PDF document text
    • https://cdn.sqhk.co/vagofedewat/Xtiieic/jurassic_tribes_events.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470979/normal_600e4be389b43.pdfIn PDF document text
    • http://prostotit.site/20986966255932u.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/survival_battleground_apk_modmaij5.pdfIn PDF document text
    • https://cdn.sqhk.co/zagusebipin/bibVieK/masaruzutanupu.pdfIn PDF document text
    • http://muxadar.22web.org/gosigamer.pdfIn PDF document text
    • https://cdn.sqhk.co/purorelaz/Kiddgis/the_last_wizard_achievement_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/seranowe/ontjcTB/stickman_rope_hero_mod.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
    • https://s3.amazonaws.com/vatosolikijike/the_beloved_charioteer_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/spiderwick_chronicles_pc_game.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/paginebakuvakokiw.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/video_boboiboy_galaxy_episode_14.pdfIn PDF document text
    • http://zimunumiwu.epizy.com/72743785343.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80D 5192 bytes
SHA-256: fa07a0f2625341cfbcc2a4dd9a25c5f4755a19b7992493c7ac8396de38bd098f
font_01_sfnt_off0000e9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 10128 bytes
SHA-256: 3d3829ff56039cd51ca49f5646c0253e5ad18d0f289f089c591d44b1dd2f95b7
font_02_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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