Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa23bfce7457344…

MALICIOUS

PDF

75.0 KB Created: 2021-03-24 17:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bc244ce4ff8e9deaf1ed5f8f99456c88 SHA-1: cd75e632b253a4fb8aa127c39e6549d8e2a30e04 SHA-256: 7aa23bfce745734471aefb7f352411fc6f752a1ef7eead89d6757df02632bea4
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate that the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fokemale.ru/123?utm_term=guided+cycling+tours+ireland PDF link annotation
    • http://wofoweniwer.iblogger.org/snowbear_trailer_specifications.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/TSokiiD/gaming_console_with_steering_wheel_and_pedals_ps4.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/80702423352.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/jgj97lT/idle_motorcycle_factory_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vabadoma/jdjhcjj/free_first_grade_math_videos.pdfIn PDF document text
    • http://1pokypki.website/classical_sociological_theory_a_readerwa1zf.pdfIn PDF document text
    • https://cdn.sqhk.co/teforoke/ihjgkii/fazamupiwejiseza.pdfIn PDF document text
    • http://armada.technology/butterfly_hd_wallpapers_for_mobile_phones39k3l.pdfIn PDF document text
    • http://imm-shoes2.club/ridakegopasikitapuporifa7wirv.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/afcat_2_result_2020_download.pdfIn PDF document text
    • http://kreativoblako.com/tovokejxwx.pdfIn PDF document text
    • http://samo-katim.ru/population_pyramid_stagesjxz0b.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/juxesuzuludezegofixuvoxa.pdfIn PDF document text
    • http://sifinujox.sportsontheweb.net/atomic_mass_and_atomic_number_of_elements.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/givatugawuba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tirisesu.onlinewebshop.net/kotepasexix.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/75337329322.pdfIn PDF document text
    • http://batogegimuwew.rf.gd/buderus_termostat_rc35_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/alopecia_androgenetica_masculina.pdfIn PDF document text
    • http://tovujopojat.epizy.com/chevrolet_ss_service_manual.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/murray_lawn_tractor_for_sale.pdfIn PDF document text
    • http://kawerulim.onlinewebshop.net/how_to_eat_fried_worms_chapters.pdfIn PDF document text
    • http://lonozixugixapap.epizy.com/google_marketing_platform_campaign_manager.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_off0000e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 5240 bytes
SHA-256: b9185e04a4a59f43d9b6b57af7b174769509646f52a1ec0dc98b832e3aab59af
font_01_sfnt_off0000fa26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 10744 bytes
SHA-256: 19d28ec8327babbbd8c31120426e33aa1b735490e0aaae89f1fbe660aec93c5e

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