Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c40532e78fc7fd9…

MALICIOUS

PDF

77.1 KB Created: 2021-03-12 06:36:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 038fcc9c2e91770a9b84df088c06c690 SHA-1: fc3fd7365267dde13b2609b81c94ea94321d36ab SHA-256: 6c40532e78fc7fd924910c5046ddb20182cbe12949c939702c9143db47bb6a6d
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL pointing to a suspicious domain, identified by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'cellule de sertoli' and mentions 'wkhtmltopdf', indicating it was likely generated by a tool rather than being a legitimate document. The presence of external URIs and the ML classifier's high confidence score support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/award?keyword=cellule+de+sertoli+pdf PDF link annotation
    • http://busimaderule.mywebcommunity.org/build_your_own_racing_cockpit_plans.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/tav_prasad_savaiye_fast.pdfIn PDF document text
    • https://cdn.sqhk.co/sazobenapur/hVhahmm/xebitunilitin.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/eYaFHnV/rim_defence_academy_jhotwara_jaipur.pdfIn PDF document text
    • http://pumaguli.scienceontheweb.net/python_set_environment_variable_for_subprocess.pdfIn PDF document text
    • http://delozofize.scienceontheweb.net/form_i_9_list_of_acceptable_documents.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/heibhuM/32649904367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427103/normal_6011d67431923.pdfIn PDF document text
    • https://cdn.sqhk.co/potebuso/iILsb00/83958655922.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/sukasigijeroligulopaw.pdfIn PDF document text
    • https://cdn.sqhk.co/jegivoziba/fqjf5a2/piano_tiles_3_vip_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_6049b11891ed5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mawidinivetobi.myartsonline.com/husqvarna_riding_mower_yth24v48ls.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/d_link_dsl_2730u_configuration_mtnl_broadband.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/anti_aging_foods.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/what_are_the_11_steps_to_writing_a_research_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/what_thickness_rope_for_tree_swing.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/rizagakenuribatetam.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/preschool_weekly_lesson_plans_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/midatelobefituripugok.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_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 4728 bytes
SHA-256: 7ae2c7904ec5f7bd4297e728dd4084cb06002dac27c4cf6caa25c0e015c7641d
font_01_sfnt_off000100d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D2 11448 bytes
SHA-256: dd6468c47a7b40bb8fa9823a7f8d62918ec97334ad438786c69da8a502b8a0b1

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