Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90a3e8f919e3c06…

MALICIOUS

PDF

72.6 KB Created: 2021-03-15 21:27:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6183ca0a612550e33954e270f9ac4ab0 SHA-1: 422ef4d55ef6690c1ef71c9017ca0c65eef480bd SHA-256: b90a3e8f919e3c06975bcd061e0b2b465e7b7856b496a2445851d37e6ae339c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to numerous disposable domains, likely for phishing or malware distribution. The 'Help wanted ad worksheet' text suggests a social engineering lure to encourage clicks on these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=help+wanted+ad+worksheet PDF link annotation
    • http://bitjoms.xyz/can_you_still_play_gta_iv_onlineph82q.pdfIn PDF document text
    • http://zonitupupafof.sportsontheweb.net/dodatojanija.pdfIn PDF document text
    • http://gnfcns.info/espero_curarme_de_ti_significadogff8j.pdfIn PDF document text
    • http://moneyindia.site/used_yard_machine_riding_mower_for_sale88fzn.pdfIn PDF document text
    • http://usacreditmonitoring.info/ketoxekidedewunifeusr5u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_601bb086a7e32.pdfIn PDF document text
    • http://fitit.space/zakidoofqsc.pdfIn PDF document text
    • https://cdn.sqhk.co/bipozipo/fDnmegi/hill_climb_racing_car_2_game_download.pdfIn PDF document text
    • http://keepxufi.space/convert_to_word_doc_adobe_readeryjvxo.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/bVlIjbK/guess_the_emoji_movie_level_32_answers.pdfIn PDF document text
    • http://doweryklkq.space/invertebrate_zoology_book_freehfht1.pdfIn PDF document text
    • https://cdn.sqhk.co/giruzegovu/P85jhjG/boat_wallpaper_hd_free.pdfIn PDF document text
    • http://bilkaita.space/reviewing_the_parts_of_speech_worksheet_9_answer_keydllqq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374542/normal_5fd704d220eff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493888/normal_603a58cca1186.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/nvjcha9/volavesejiturijoreg.pdfIn PDF document text
    • http://metryck.info/98719520776inju8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wilosokanik.myartsonline.com/58250421754.pdfIn PDF document text
    • http://geforagegi.atwebpages.com/39966966608.pdfIn PDF document text
    • http://pawepeg.atwebpages.com/cambridge_latin_course_unit_1_dictionary.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_off0000e15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15A 5164 bytes
SHA-256: a638ad99364f203b0f5bcdbb03d6d422de8777fc442bcf5a7916fec1c9e86c5a
font_01_sfnt_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 10120 bytes
SHA-256: 0b6a6283777b23587a5b033e5fc0177e5d7bb691e53d4ff2675be1c041e9f1fc

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