Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3dac0418ae26f9…

MALICIOUS

PDF

73.4 KB Created: 2021-02-18 20:49:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e0164df816b3e34331749f9e57939e77 SHA-1: 53da10094ea6b95e219f091dec64237b52445a19 SHA-256: be3dac0418ae26f987e82bdbc51378b327f58d85800c61e4bd409948d466bed5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to suspicious domains that are likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a link farm designed to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/123?utm_term=kill+team+rules+pdf+2018+vk PDF link annotation
    • http://cmbclientes.com/gunuvixavapolupogedwx6ou.pdfIn PDF document text
    • http://sukotis.iblogger.org/describe_how_a_full_moon_can_occur.pdfIn PDF document text
    • http://compte-cmbretagne.best/past_continuous_tense_and_past_simple_exercises6xaw5.pdfIn PDF document text
    • http://sokolov.fun/vue_eclatee_boite_de_vitesse_peerless3ai1j.pdfIn PDF document text
    • https://cdn.sqhk.co/pidenali/jiibpge/assistant_professor_salary_unc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467581/normal_6026d42c06560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_602462157f006.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/hdhahdj/diary_with_lock_app_for_android_download.pdfIn PDF document text
    • http://callipakk2.site/leworibalidobazemexujudr6mxf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470968/normal_602c87e8ce32d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498971/normal_5ffea1a5cf53e.pdfIn PDF document text
    • https://cdn.sqhk.co/jozanafe/ghwqcXX/smart_car_for_sale.pdfIn PDF document text
    • http://nejewif.iblogger.org/catch_up_tv_travel_guides.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/tulosa/libro_materialismo_histerico.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/comparing_values_of_philippine_money_worksheets.pdfIn PDF document text
    • http://munakazoxan.epizy.com/42697644290.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/ubuntu_14._04_lts_32_bit_free.pdfIn PDF document text
    • http://xibobok.rf.gd/71352092293.pdfIn PDF document text
    • http://damaxokabipo.epizy.com/uniforme_chasseur_ardennais_1940.pdfIn PDF document text
    • http://pasazaxara.rf.gd/wekanafu.pdfIn PDF document text
    • http://zalezir.epizy.com/what_are_three_things_you_like_about_yourself.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/portuguese_to_english_dictionary.pdfIn PDF document text
    • http://tavixemurivadol.rf.gd/is_a_pressure_sensor_analog_or_digital.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_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 5800 bytes
SHA-256: 52025abb5464a3ca5ff67bd0911343cad9f373b7cd8c6aead3dadd73d18c5940
font_01_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 11368 bytes
SHA-256: fa33ef4d912cafc6a8ccda9714b5d5ff5dccf0618ffde2adbcf1cdfd6010c4f3

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