Malicious PDF — malware analysis report

Static analysis result for SHA-256 1925d4e4e6750e39…

MALICIOUS

PDF

79.1 KB Created: 2021-03-20 01:43:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 31c6cc8b473d7da20e51783de5a9395d SHA-1: b0da91783ed1406312f093559e11d26a80e87c4d SHA-256: 1925d4e4e6750e398c6b642b2fd451aa82d97c300c38db28294b40e16320904e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://xezojetit.ru/wix?keyword=forex+fundamental+analysis+for+beginners+pdf PDF link annotation
    • http://energierecrute-emplois.com/nipifusokewofifavawuorlwi.pdfIn PDF document text
    • http://juzezudusota.mypressonline.com/what_are_3_negative_character_traits_does_odysseus.pdfIn PDF document text
    • http://idealica-columbia.site/do_accu_chek_lancets_expire02ljc.pdfIn PDF document text
    • http://vojemodipu.sportsontheweb.net/4_letter_words_that_start_with_n_and_end_with_r.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/75EhiTb/sound_blaster_crystal_voice.pdfIn PDF document text
    • http://zesamoa.online/how_to_write_a_text_response_essay_year_12o9wdp.pdfIn PDF document text
    • https://cdn.sqhk.co/zenipijujate/gey01RL/89066473836.pdfIn PDF document text
    • http://sq11mini.com/nexagqu7kb.pdfIn PDF document text
    • http://lotukaguw.sportsontheweb.net/asus_laptop_q550lf_drivers.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/56735708766.pdfIn PDF document text
    • https://cdn.sqhk.co/rapedipular/vcMhheh/20000028813.pdfIn PDF document text
    • http://visiblawty.com/fufuvuvopikamekk41kg.pdfIn PDF document text
    • http://garobunatuxovi.scienceontheweb.net/77252170254.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/9ead72e6-41ce-4ea7-8f19-7e77b5d1406b/does_dunkin_have_sugar_free_caramel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a8e754-a6e6-45fc-822f-de1d42d86da3/motazafawepedul.pdfIn PDF document text
    • http://bexukavibume.myartsonline.com/small_caramel_iced_coffee_dunkin_donuts_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e32183bd-a9fa-40f9-8dd8-3e4eb5846806/movie_review_worksheet_for_high_school_students.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/how_to_replace_dryer_belt_on_kenmore_stackable.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/agile_software_development_techniques.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_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 5628 bytes
SHA-256: a1ad294fc9a82e5578f9d3ddf5bec58085915ea8938bfdfadfe4b72d228e7d89
font_01_sfnt_off00010a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A22 10716 bytes
SHA-256: 06533fa167c12fde1b550e680b738dcf076d68c797482bbfbc55d5804bec3891

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