Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b91d6a92c36311…

MALICIOUS

PDF

80.7 KB Created: 2021-03-20 19:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 397ffdce94ab7787b930de700c8ca5dc SHA-1: 98a1bc64a658f64748baae129412ea170ff3acf8 SHA-256: c4b91d6a92c363119becea21c6641e91b3e7676be5e2a29f7f0b2901d1075b7e
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

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://lozipotod.ru/strik?utm_term=what+is+a+archetypal PDF link annotation
    • http://it50life.pro/how_to_change_fan_speed_on_american_standard_furnacel7pe0.pdfIn PDF document text
    • http://fitit.space/openstax_university_physics_volume_3d83i8.pdfIn PDF document text
    • http://japamawosoj.mygamesonline.org/anemias_hemoliticas_clasificacion.pdfIn PDF document text
    • http://lozomaneje.getenjoyment.net/dalawowa.pdfIn PDF document text
    • http://zebiripu.mygamesonline.org/arabic_words_to_english_translation.pdfIn PDF document text
    • http://vladmer.ru/wool_hugh_howey_audiobookl7p95.pdfIn PDF document text
    • https://xofivexaroza.weebly.com/uploads/1/3/4/3/134321457/5f498d7a91fe4c.pdfIn PDF document text
    • http://pochta-24.cc/daily_life_of_ancient_egyptian_priestsdhz5i.pdfIn PDF document text
    • http://gepavozo.mygamesonline.org/88481491763.pdfIn PDF document text
    • http://sesesuruko.mypressonline.com/brother_hl_2140_driver_win_10.pdfIn PDF document text
    • https://zevenaxef.weebly.com/uploads/1/3/4/7/134745307/5427403.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/fumewemimut.pdfIn PDF document text
    • http://hookup153.online/easy_ukulele_songs_for_beginnersmpu9m.pdfIn PDF document text
    • https://femuxejafedanib.weebly.com/uploads/1/3/2/7/132740958/lebunor_lelum_lofiwipatufev_gobet.pdfIn PDF document text
    • http://fragcups.com/what_does_light_and_dark_mean_in_artvrtd9.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/5383725.pdfIn PDF document text
    • http://mangalvpodarok.ru/kenmore_progressive_canister_vacuum_filter_replacementlrtmu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d14c0990-ab97-4da8-8b8f-236f4d1859ee/past_tense_verbs_for_esl_students.pdfIn PDF document text
    • http://nopawalaxuwaw.onlinewebshop.net/how_did_the_second_great_awakening_contribute_to_reform_movements_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3960bad-b6bb-4d36-9ef3-164243d0d258/26752607117.pdfIn PDF document text
    • http://xizokenimufewom.atwebpages.com/lista_de_verbos_regulares_e_irregulares_mais_usados_em_ingles.pdfIn PDF document text
    • http://tafiwepamubov.atwebpages.com/motivational_story_in_english_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14d4c788-d223-4efb-938d-cec980860095/mesa_dual_rec_rev_g.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/999378cb-b9c9-4e3f-8d26-f1ec4201a67f/why_does_my_washing_machine_have_no_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0822e70d-4e9a-426d-8bd2-f88725b94f6f/radevorafolaji.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_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 5136 bytes
SHA-256: 8054e5722df001c5a85e71013f3084543d21cda5d4652a7770862aa3961fd91c
font_01_sfnt_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 14512 bytes
SHA-256: ddc836277df64e0e36c4fe801a944ad58d063e714722263fc2733b3aa796c70b