Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ce141bd5acaffa…

MALICIOUS

PDF

74.9 KB Created: 2021-04-03 20:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de5000f5880dcc6593fc6e53df2815ff SHA-1: b17c7da516d1cf1461ba919ca741307d96dbb9a1 SHA-256: b7ce141bd5acaffa4c8883414cb9638ba89b334c7b761e209f6aadb0b1bc0ca8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to obscure domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=sensory+words+worksheet+pdf
    • https://golotarati.weebly.com/uploads/1/3/1/8/131856611/5820939.pdf
    • http://reawont.online/nimavozotumodbdr0.pdf
    • http://siluvuxifebul.medianewsonline.com/acrylic_painting_techniques_book.pdf
    • http://instapriz.online/fun_vocal_warm_ups_for_high_school_choirvy1sv.pdf
    • http://polystate.ru/new_king_james_study_bible_for_salevq53t.pdf
    • http://loxiturizule.sportsontheweb.net/vittoria_mio_core_low_voice.pdf
    • http://miribut.mywebcommunity.org/alesis_q25_driver_download.pdf
    • http://hotloveme.online/what_film_do_you_use_for_polaroid_30008xog.pdf
    • http://opt15.ru/cuisinart_dlc-8_plus_replacement_partstay2v.pdf
    • http://sadinexiwa.mygamesonline.org/bluedio_t2_plus_turbine_wireless_bluetooth.pdf
    • http://becloud.website/how_to_reset_samsung_galaxy_grand_prime_plus_without_google_accountujztf.pdf
    • https://zatakigufexip.weebly.com/uploads/1/3/0/7/130738978/1724602.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ravuxudibure/atlantica_online_class_guide.pdf
    • https://s3.amazonaws.com/warapagefasovi/full_bengali_movie_chirosathi_2008.pdf
    • https://s3.amazonaws.com/safenalavojuwu/xojolitanajanodaf.pdf
    • http://lapetagalelan.myartsonline.com/dumigaxexi.pdf
    • https://uploads.strikinglycdn.com/files/cbf7da4c-e6c6-4e41-bbe0-5ed7dab6faef/the_monkees_tv_show_dvd.pdf
    • https://uploads.strikinglycdn.com/files/2264fcde-bb7f-485c-90b4-3b85d68bb915/mujogapu.pdf
    • https://s3.amazonaws.com/gapivegek/what_is_factless_fact_table_in_data_warehouse.pdf
    • https://s3.amazonaws.com/rijaliwiguvex/is_executive_director_higher_than_general_manager.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e73e.bin
fcfdfb0589b47f540f798d8fb59f5bfa49dd01d8aa83d698eab7cbc8fe404f10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE73E 5248 bytes
font_01_sfnt_off0000f92f.bin
7651c7e0ccf52cc325b48c062391ca8b222064f8b49cdac0e6fd1f72d167231d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 10956 bytes

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