Malicious PDF — malware analysis report

Static analysis result for SHA-256 1920eb3feb276bc1…

MALICIOUS

PDF

95.8 KB Created: 2021-03-29 20:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a9e28dccb3a799db23a3012de5c0018d SHA-1: 5b5e08919c0c5525b9b1a8a9a84da089d7da96de SHA-256: 1920eb3feb276bc131b46737ad864e1b00b63467687b0596da71e448ba7beb1d
126 Risk Score

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 0.9990

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://kuzutuzo.ru/123?utm_term=nielsen+music+report+2018 PDF link annotation
    • https://cdn.sqhk.co/mubafazus/3Jogiev/panawetaniravunobutawofud.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/sanwa_analog_multimeter_manual.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/18251738579.pdfIn PDF document text
    • http://trynutra.shop/xuzasofisumulatadozjrlio.pdfIn PDF document text
    • http://vkrowl.com/how_do_you_read_an_ekg_stripoi35q.pdfIn PDF document text
    • https://cdn.sqhk.co/tawibonikigo/kxhjgg0/kuwepodako.pdfIn PDF document text
    • https://cdn.sqhk.co/sejarepezibo/X9fhjMR/viduposo.pdfIn PDF document text
    • https://lomoludogakure.weebly.com/uploads/1/3/4/3/134364850/letituma.pdfIn PDF document text
    • http://tikixoji.mywebcommunity.org/9494775429.pdfIn PDF document text
    • http://zimonima.22web.org/schwinn_active_20_recumbent_exercise_bike_manual.pdfIn PDF document text
    • https://luzonenof.weebly.com/uploads/1/3/4/5/134509067/6268684.pdfIn PDF document text
    • http://lazadacostumercenter.com/civil_engineering_drawing_symbolskgf7a.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/M7tTric/jikogafapojazax.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/jjg3Jgj/girl_voice_changer_free_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/foneniz/acute_bronchitis_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/algebra_1_assessment_book_big_ideas_learning_answers.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/74800349131.pdfIn PDF document text
    • http://kezasifofajimo.rf.gd/embroidery_basics.pdfIn PDF document text
    • http://kesupipipiret.onlinewebshop.net/sigareguba.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/canon_vixia_hf_r800_price_in_pakistan.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/android_checkbox_set_checked_not_working.pdfIn PDF document text
    • http://bajivuselome.epizy.com/temepopukivu.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/assamese_song_2018_new_asomi._in.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_off0000fc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 20944 bytes
SHA-256: bb079d2cf91774bd6f5f72c7e8d116ed4eb5aa20a6850ce5f6d6bbbd868044ea
font_01_sfnt_off00013909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13909 5360 bytes
SHA-256: 8cd274a5a00092e9f2a2796fd474f9023b706e85651329e9439ba4e36233d5f4
font_02_sfnt_off00014b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B3F 11084 bytes
SHA-256: 40bfa7a991152cb8d95dc943fb08dfbe199d59b5dcefead4d4d913ec1c3c9144

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