Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cee988c9135ea3…

MALICIOUS

PDF

79.1 KB Created: 2021-03-27 15:29:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e14f2f90f463d6e22e9f7e5ce9a8b199 SHA-1: b2a6936c9bcb20f5965b628835891a39b54b1a27 SHA-256: 91cee988c9135ea328b8e7697de501d24e3087f182508882797c7afa40445f01
134 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged as malicious by ML classifiers and ClamAV. The document body, though heavily obfuscated, suggests a lure related to downloading a 'hack apk'. The embedded URLs point to disposable hosting and potentially malicious domains, indicating an attempt to redirect users to download unwanted software or further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/wix?keyword=despicable+me+minion+rush+hack+apk+android+1 PDF link annotation
    • http://zojulosopejozaz.iblogger.org/whirlpool_quiet_partner_3_filter_cleaning.pdfIn PDF document text
    • http://dronextactical.xyz/3rd_grade_homework_freeschsv.pdfIn PDF document text
    • http://blekrossi.ru/bissell_proheat_turbo_2x_partse9qk9.pdfIn PDF document text
    • http://xeboxemovev.66ghz.com/free_letters_from_santa_templates_to_print.pdfIn PDF document text
    • http://ekzo-fruit.ru/gokibijusozep55ec.pdfIn PDF document text
    • http://wisajekunitope.22web.org/the_kybalion_review.pdfIn PDF document text
    • http://afracheat4.xyz/serta_motion_iseries_adjustable_basenltpz.pdfIn PDF document text
    • http://kowezuzapine.66ghz.com/isms_test_questions_and_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://budezeja.rf.gd/31514482677.pdfIn PDF document text
    • http://livutogugusal.rf.gd/sepsis_2020.pdfIn PDF document text
    • http://bobiwaj.rf.gd/korutujujadazurodofivusi.pdfIn PDF document text
    • http://riniwipum.rf.gd/small_bowel_obstruction_radiology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b59ae9ac-792f-413a-bb27-908a27010f95/jupefonafuxadup.pdfIn PDF document text
    • http://kusogit.rf.gd/43599483773.pdfIn PDF document text
    • http://giniwovobodomu.epizy.com/makkar_ielts_writing_task_2_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cc816f5-5988-4e1e-8a53-771d3a25e306/group_theory_politics_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5780dde8-d6f1-48ba-a4b0-6f036e053824/duliw.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/boston_bruins_schedule_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/bavubutude.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/se_puede_comer_higado_de_cerdo_en_el_embarazo.pdfIn PDF document text
    • http://divupalol.epizy.com/descargar_arbatel_de_magia_veterum_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe3c154-80f4-4eb0-9736-fc898345976c/guvakorevitipijamir.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_off0000f6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 5568 bytes
SHA-256: ebf37e4a7e89be367b8cc1d970ddab2b99e121cefb9fe36b7d377670650733a9
font_01_sfnt_off00010996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 11132 bytes
SHA-256: 6f18b6005a532c523e944ea5f43a407cc9fa1dc4abc75e4336a22e1a0b9a065e

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