Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c19f0514f9d5ca8…

MALICIOUS

PDF

71.8 KB Created: 2021-03-13 16:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9b3cfa2f5f63862bc3bbc5fd377ac249 SHA-1: 521e14be3179c611a2695a3a7921c078d5c00d10 SHA-256: 1c19f0514f9d5ca8ffe31210f05618a0bc0cfe4c811ca78c2fc4efc0840b6f15
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm, a common tactic for phishing or distributing further malware. The presence of 'utm_term' parameters suggests tracking or redirection, further supporting a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://kuzutuzo.ru/123?utm_term=wave+air+lock+screen+apk PDF link annotation
    • http://bettermoneytips.com/organic_chemistry_vollhardt_7th_edition9ifwp.pdfIn PDF document text
    • http://dashcamtopbest.com/fifigogogovovapavazgod4b.pdfIn PDF document text
    • http://about-central.com/85826623990hv3s0.pdfIn PDF document text
    • https://jotutavujisab.weebly.com/uploads/1/3/1/1/131164129/4810683.pdfIn PDF document text
    • https://salubekera.weebly.com/uploads/1/3/2/7/132740515/bogafilodu.pdfIn PDF document text
    • https://jabefebilinoke.weebly.com/uploads/1/3/0/7/130739415/4387924.pdfIn PDF document text
    • http://jaxuvarimirenu.22web.org/68355017027.pdfIn PDF document text
    • https://basalolevezuw.weebly.com/uploads/1/3/1/6/131606508/xuborajasepez.pdfIn PDF document text
    • http://seplafond.xyz/xisafopivexufutibugn7nj.pdfIn PDF document text
    • https://natugivekoxatan.weebly.com/uploads/1/3/1/3/131380011/vejojurafugugi.pdfIn PDF document text
    • http://banoduber.iblogger.org/2288515254.pdfIn PDF document text
    • http://dronextactical.xyz/gegusidazn2hp5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9cd52034-36ad-41d2-a9c3-e77c94af2cbf/dama_dmbok_framework.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/age_of_empires_2_gold_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c61566-9035-4c82-8b12-811068ed7177/the_forever_war_movie_2018.pdfIn PDF document text
    • http://vadawowugozopul.epizy.com/donalolerasorulafijaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/095c7498-b4d9-4150-8b75-a13d4cf80305/lightning_thief_musical_cast_recording.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d2c8402-19aa-456d-9b0c-0a8ebdb2eff5/honeywell_quietset_fan_noise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9da4833-e67d-4f6c-9edf-5dbd5f0af4c7/blue_jackets_jersey_2000.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/jovinoxozafagoxugukuvo.pdfIn PDF document text
    • http://vavijiguzedimeg.epizy.com/72447787315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6967a440-37a6-4826-aacd-30443ec0ad4e/sibar.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/message_app_windows_10.pdfIn PDF document text
    • http://xozitogik.epizy.com/three_questions_leo_tolstoy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/becf0acf-067b-46c2-8f1a-f3acbb158f6a/medios_de_comunicacion_interna_y_externa_en_una_empresa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD015 4772 bytes
SHA-256: 143285a0df2b63ff7bd38e74840462b8df9d51f2e914201003ab20c2e24eec85
font_01_sfnt_off0000e05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05B 10264 bytes
SHA-256: 2ea034b8cc6ca9cf5b93ce0dd67ac6f28ca7ff6df514b3ab3c6f12db19466a97
font_02_sfnt_off000103a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2