Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10a7b66d7e028af…

MALICIOUS

PDF

79.5 KB Created: 2021-03-06 11:18:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6755bbf6a2634eb2353cb9ab34784c8b SHA-1: 03952f2bca769be69b7ac8a88e47db4d95a0bcc3 SHA-256: b10a7b66d7e028afff24a1663f8ce2f64cf02495cdacd58073392f2a5b727f70
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it may exploit vulnerabilities or lead to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://kuzutuzo.ru/wb?keyword=the%20pilgrim PDF link annotation
    • https://tagopudul.weebly.com/uploads/1/3/5/3/135392217/joforo.pdfIn PDF document text
    • https://turamidiwirak.weebly.com/uploads/1/3/4/3/134340523/wunefam-zaxipoti-xulipisipidaku.pdfIn PDF document text
    • https://tizemafuniture.weebly.com/uploads/1/3/4/6/134636649/746023.pdfIn PDF document text
    • https://sakuvajavabese.weebly.com/uploads/1/3/1/3/131383602/revezujav.pdfIn PDF document text
    • https://liziwozubol.weebly.com/uploads/1/3/4/8/134851467/9511726.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/libeganot/bouwbesluit_2005.pdfIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_2814e4d63c7d47f48e8b6f4f407b6c8d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/160e4f15-e3d6-4c20-a9db-022b013463db/vishnu_sahasranamam_in_gujarati.pdfIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_3f8505b29a654fee8c5b1afa01d17993.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nefagolom/ropusaxotanitemaloxazopam.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/aftertale_sans_fight.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_ee019fc458e24a4698668b3a596bbc1f.pdf?index=trueIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_a11c72286d304cd2b25bddd4b7d6f468.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/093feccb-1b97-4dc0-893c-0bc947465d17/the_montreal_cognitive_assessment_moca_test.pdfIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_50d8912c713147969395de7cf7a3f362.pdf?index=trueIn PDF document text
    • https://f62a3995-63c1-43d8-9567-a18c4730807f.filesusr.com/ugd/b1277d_5d0a9097fccb4e49a85084ddbfec710b.pdf?index=trueIn PDF document text
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_6e1735b402ac42c98ec7868e5cd11bd0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8692cc0a-d9c7-46f9-a6df-f091775f2910/79612982465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56e4c8c6-4752-46fb-800f-e0afb37f09e1/toyota_camry_hybrid_se_2019_price.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_d84318ead67e45ba970ab890bf372754.pdf?index=trueIn 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_off0000f916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 5564 bytes
SHA-256: 5b23eb7ea0fb398419d20d3e53525145bb10433dbe435c81eb096d888ff016ae
font_01_sfnt_off00010bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF1 10572 bytes
SHA-256: 2b41a463839064f6c6c08340b658a1d4ca2d729a6a097a9c02630b36f9340286