Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fadeb93f3bd996…

MALICIOUS

PDF

125.4 KB Created: 2021-02-06 12:13:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5962dd33c16a8a06f7aa1cd27e431203 SHA-1: 93e1659de76d832f1cb92f8a0fa9894c460fd876 SHA-256: 90fadeb93f3bd996415f5eb5437ca8831a288cebfab4ffdb374350aa0de7aa42
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a 'Redemption of partnership interest form'. The presence of numerous links hosted on disposable domains and the ML classifier's high confidence score indicate a phishing or malicious redirection attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=redemption+of+partnership+interest+form In PDF document text
    • http://proita.space/adjusting_entries_practice_problems_with_answerspuntx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487665/normal_601905f533c51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403131/normal_5ffd1d1c04c03.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/jcjjIie/build_battle_ideas_bloxburg.pdfIn PDF document text
    • http://twobigs.space/39870354iqt5q.pdfIn PDF document text
    • http://takipleskazan.org/bjsc_syllabus_2020_downloade5drf.pdfIn PDF document text
    • http://igbusinessabouthelp.com/wallpaper_games_hd_android_darkojx6m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468819/normal_5fd634fd1ecb4.pdfIn PDF document text
    • https://cdn.sqhk.co/kizulajeli/j01ijhi/xiponajawemapolanetareze.pdfIn PDF document text
    • http://effektzhizni.ru/join_clash_3d_apk_purep3uw0.pdfIn PDF document text
    • http://vvd.bar/download_print_driver_for_hp_officejt6tye.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/5BmXALX/33698320583.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bekisamusexasu.rf.gd/879349262.pdfIn PDF document text
    • http://popuzavefigud.epizy.com/79188621794.pdfIn PDF document text
    • http://dajejumu.rf.gd/pkp_bielsko_biaa_telefon_informacja.pdfIn PDF document text
    • http://fitemis.epizy.com/aimbot_for_free_fire.pdfIn PDF document text
    • http://poramukuwulaji.epizy.com/92513854524.pdfIn PDF document text
    • http://joriboka.epizy.com/46090672364.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_off0001ae74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE74 5256 bytes
SHA-256: a1f297b25a4a2e5c6cafa0fc2b9a2338bbed5b71e3c7e3424212fc45a83bf728
font_01_sfnt_off0001c02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C02E 11020 bytes
SHA-256: e2a7cd8d1f0b548470ef31ebbe35ea829b038fc8a617f558ace535ae0ddf5f6a

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