Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34396704e6dae86…

MALICIOUS

PDF

71.1 KB Created: 2021-03-20 03:46:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7534031d0eaa70dc8680296ab294a363 SHA-1: aecb05bc453232de1e5ec3f9ddbbc5e0c297536c SHA-256: a34396704e6dae86b644163b7336ab5e53c31842a75a462e215d97e7c8ae1f4c
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or are associated with link farms, suggesting a phishing or scam lure. The presence of external URIs and the overall structure point towards the file acting as a downloader or redirector for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=cradlepoint+mbr1400+mission+critical+broadband+router PDF link annotation
    • http://kakorezikudu.mypressonline.com/preparing_for_interview_questions_and_answers.pdfIn PDF document text
    • http://jomikifu.medianewsonline.com/archidoxis_magicae.pdfIn PDF document text
    • http://doxalasi.mywebcommunity.org/what_state_produces_the_most_dairy_farms.pdfIn PDF document text
    • http://dusanaputojinon.mygamesonline.org/still_alice_full_movie_download.pdfIn PDF document text
    • http://xivetaf.22web.org/49903943018.pdfIn PDF document text
    • http://pycnidwzxc.info/types_of_curriculum_vitae_template_wordm1g3o.pdfIn PDF document text
    • http://evakuator-uga.ru/36728815502lv35k.pdfIn PDF document text
    • http://vigikigopaloze.medianewsonline.com/xomikivetodo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_de9c86ee62ec460799b8384cd7d5a30a.pdf?index=trueIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/candidiasis_oral_tratamiento_en_nios.pdfIn PDF document text
    • http://votixeju.onlinewebshop.net/bilingual_benefits.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_0626aae8a32e4ab08ae15b989255eb42.pdf?index=trueIn PDF document text
    • https://849cba27-c1c2-4801-a47f-514a08c45c3c.filesusr.com/ugd/7f7a2c_1e8dcfd764824294a63853a1d239efc5.pdf?index=trueIn PDF document text
    • http://bolirazebaf.myartsonline.com/44613324052.pdfIn PDF document text
    • http://vajapojaperusu.myartsonline.com/oxford_phonics_world_1_the_alphabet_workbook.pdfIn PDF document text
    • http://sirerig.epizy.com/convert_file_to_word_doc_for_free.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_off0000d699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD699 5544 bytes
SHA-256: 5087dcec0f9f83f67bc0b830eeb629d94f931b00a6d2dfd8a8452dfe3dd46b93
font_01_sfnt_off0000e958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 11180 bytes
SHA-256: 2711b04bfad069d101607c39cd93bb0214d71a63b25c8396dfd9f9880faefcbb

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