Malicious PDF — malware analysis report

Static analysis result for SHA-256 e356fc83a959b5ef…

MALICIOUS

PDF

135.7 KB Created: 2021-03-14 09:50:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: fac023d7ff27881d1001092d35284803 SHA-1: 56b1f56890ab9f905e508e7fe92a5d9366c288ee SHA-256: e356fc83a959b5efc2d57d773a406aa2fef151cb39dcc106a0d2c1000375cbc4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a domain associated with phishing activity. Heuristics indicate the PDF functions as a link farm on disposable hosting, likely to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://vilenefex.ru/wix?keyword=hearing+lips+and+seeing+voices+pdf PDF link annotation
    • https://cdn.sqhk.co/toviranevu/Ejgjhih/22366457066.pdfIn PDF document text
    • https://cdn.sqhk.co/nojebimit/g10oii1/infinity_train_simon_and_the_cat.pdfIn PDF document text
    • http://rufafepikawaj.22web.org/millionaire_teacher_review.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/iehhUoo/fake_call_from_among_us_apk.pdfIn PDF document text
    • https://wuduzavuvavazi.weebly.com/uploads/1/3/4/6/134618101/3097025.pdfIn PDF document text
    • https://cdn.sqhk.co/nujudemugipi/JoFnSia/65035159058.pdfIn PDF document text
    • https://pinuxutorifepo.weebly.com/uploads/1/3/4/5/134503053/7432595.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/ih8po46/gabixunotug.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/4fe4a20a-d7be-41c0-a0b4-432a8077b6c8/polaris_office_5_for_android_free_download.pdfIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_aad9d9dc1f1a430488f97c0b22451ff3.pdf?index=trueIn PDF document text
    • http://tuvajitivozozek.rf.gd/series_of_unfortunate_events_books_ranked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bbdb33b-c895-4433-bca2-2132852bde89/rewuxopuvogisoxa.pdfIn PDF document text
    • http://kodosalepixalan.epizy.com/wisowomizatijol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/500a4d6e-2ba6-49fc-b79b-289b645d67f1/market_wizards_series_by_jack_schwager.pdfIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_a7b8223226c348839cfea2f3f2bef80f.pdf?index=trueIn PDF document text
    • http://wabalegawamiraj.rf.gd/oxford_advanced_learner_s_dictionary_for_android.pdfIn PDF document text
    • http://sawozepanoludib.rf.gd/southern_railway_station_codes.pdfIn PDF document text
    • http://dorizoki.rf.gd/macmillan_english_6_unit_16_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac15b3f5-065c-42ea-b459-a3449a4e3d60/45937421312.pdfIn PDF document text
    • http://fidekejasogam.epizy.com/escala_apgar_y_silverman.pdfIn PDF document text
    • http://runoxujozu.rf.gd/46736030262.pdfIn PDF document text
    • http://wivowutone.epizy.com/rudodil.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_off0001d6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6F4 5344 bytes
SHA-256: cf0e46184a04b0131c2c3817a2bfa98c6e9dc744d854397d6d93c1e8e652f189
font_01_sfnt_off0001e93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E93D 11752 bytes
SHA-256: a1036ba5cfe4408e63a767b9176141deda6a546c192cb421b89ba40b3e4ed9ca

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