Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb6e4308ffd6eb2…

MALICIOUS

PDF

75.2 KB Created: 2021-06-02 18:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a252f7e88ee479781621ae6b47b46576 SHA-1: da6183c2b09e896f3bd7bd5c7ead3e7150ec79c5 SHA-256: fbb6e4308ffd6eb22c99a7b1cc68acfb83c71294b69d0e208e8654bc86f0fe3c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary URL, 'https://inwebjor.ru/pbw?utm_term=how+to+get+six+sigma+white+belt+certification', appears to be a lure for users searching for certification information, likely leading to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://inwebjor.ru/pbw?utm_term=how+to+get+six+sigma+white+belt+certification PDF link annotation
    • https://reropazorulofo.weebly.com/uploads/1/3/4/4/134437501/gevarilijaze-bijizekawozajar.pdfIn PDF document text
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/1918772.pdfIn PDF document text
    • https://fepafevadaxajaw.weebly.com/uploads/1/3/4/0/134095897/56da3d549.pdfIn PDF document text
    • https://sivaxibekexisu.weebly.com/uploads/1/3/4/4/134488572/f8763781b201eb4.pdfIn PDF document text
    • https://gajaxaja.weebly.com/uploads/1/3/2/7/132712369/bafipatinakogo.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/87bdd330-3931-41ad-a34d-2fd95d286a53/memory_rescue_master_package.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c85848ab-86cb-40eb-804f-0376e73cc996/22561572706.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/borneo_motors_accident_reporting_centre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95a93674-b33e-42f2-8c8a-d6f681a49c33/tabla_de_conversiones_de_litros_a_gramos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e90a4c8-8347-4c0d-a08e-79e1e3f00627/economics_department_rankings_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/026f9c1d-bbab-49f9-b9c1-6fa6f8b90fee/korean_natural_farming_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7db9ef23-3db2-47d8-835b-f121f4c922b2/61815756772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aabc9eb8-9475-4599-b663-a3921764bc0f/1402211356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65111653-b263-4c47-bfed-01f72504020a/55874703344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97ff4416-d8ee-4fd2-a2bd-4864f2fc3d76/betty_crocker_cookbook_1969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a7a41b0-1dd9-4064-b3a5-b6d83e729448/kotokolelijigif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a72a8827-6363-4ea2-8530-d37e1d8efd4d/how_to_reheat_pasta_alfredo.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144428343/what_gemstones_are_found_in_washington_state.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6caf5e8-7a95-4706-a256-7fdb3ea96ac6/what_does_802_mean_angel.pdfIn PDF document text
    • http://dimutojopog.pbworks.com/w/file/fetch/144474567/dream_chronicles_4_free_download_full_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff49249-9859-421c-89c2-641c5454ac86/trigonometric_formulas_class_11.pdfIn PDF document text
    • http://litorabi.pbworks.com/f/progetto_genoma_umano_zanichelli.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_off0000e718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 5556 bytes
SHA-256: 06bf74514703bf6c497d58cbb244aacb7b78100180c63593965c9eae919e4cec
font_01_sfnt_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 10932 bytes
SHA-256: b26d216f0401df3cf604060e55bf92068f15aa1cdc9fc959edc153c71c397aad