Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b5ae17fceaf532…

MALICIOUS

PDF

70.5 KB Created: 2021-03-11 22:06:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a186882d5d0829b692ad1136dafc804e SHA-1: 835bec3118c381d3f20bcad717fe3e77e37b7948 SHA-256: 21b5ae17fceaf532822e686455184bbd77e54f8483ac760b85d88ce6d5df39a1
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to downloading academic material, suggesting a phishing or malware distribution 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/award?keyword=mathematics+for+economics+and+finance+methods+and+modelling+pdf+download In PDF document text
    • https://cdn.sqhk.co/tezofugowura/ZJgdhbJ/army_toys_town_mod_apk_unlimited_money_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/jijy4hd/zopegoxoxadoxesebetimoxaz.pdfIn PDF document text
    • https://cdn.sqhk.co/likafupat/Eu1nhhf/scruff_mcgruff_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/nixenexax/jhXjaQu/83649856816.pdfIn PDF document text
    • https://cdn.sqhk.co/raninogozo/dhejfii/vadakavunijori.pdfIn PDF document text
    • http://nusowutevu.getenjoyment.net/theatre_the_lively_art_10th_edition.pdfIn PDF document text
    • http://nesarose.sportsontheweb.net/briggs_and_stratton_500_series_158cc_repair_manual.pdfIn PDF document text
    • http://fomigiv.mypressonline.com/vuxulozudogutulizo.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/iiiaCgd/gba._emu_vs_my_boy.pdfIn PDF document text
    • http://vakiduweg.mygamesonline.org/badizorimawufemuworije.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/what_is_the_cost_of_a_quit_claim_deed_in_florida.pdfIn PDF document text
    • http://gegebafebofad.scienceontheweb.net/how_to_use_a_kitchenaid_microwave_convection_oven.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabejanaboz.atwebpages.com/ukulele_songbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a42a380-2465-4cb5-9dbf-e982214291a1/jumping_the_broom_movie_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb2eb29c-168a-41df-8b15-4f0f4ec5dcbb/is_dominos_garlic_and_herb_dip_ranch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9bedcb-3067-4874-bcbd-c9c868d0738f/82339445690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc475528-9401-478f-871c-1a6f4f38c8c2/how_to_turn_off_groupme_notifications_on_apple_watch.pdfIn PDF document text
    • http://duxepivol.myartsonline.com/why_is_school_so_horrible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad4a36e2-5580-48d8-9ae9-8522c8254f13/kunotu.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_off0000d6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CF 5668 bytes
SHA-256: 3b2e9074be4850d5ae528618c1af7aac0a62f5675aeecf00cc0903b1cf53fb2a
font_01_sfnt_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 10012 bytes
SHA-256: acbf3a6262415a5c1f4e2e11aa906d5c48c16e732aab7bf3db71821f42a1cf61

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