Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9bb4ee6a922d1fb…

MALICIOUS

PDF

76.3 KB Created: 2021-03-29 14:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e8876d0ba3fd3c6a13d7a1c04bb7c43d SHA-1: 1c98fce49b2f3bef06d7aeb509157e66d6a18a06 SHA-256: d9bb4ee6a922d1fb85648ac6c55cd39726318644387a97bc174f401e6d354894
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were extracted, the PDF structure and numerous URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/award?keyword=biology+class+10+textbook+pdf+kerala+syllabus PDF link annotation
    • https://cdn.sqhk.co/tumitibira/DGiarhd/tibad.pdfIn PDF document text
    • https://zotawirimatoxo.weebly.com/uploads/1/3/4/0/134096886/6337071.pdfIn PDF document text
    • https://widalafamibag.weebly.com/uploads/1/3/0/8/130814492/7120324.pdfIn PDF document text
    • http://bagodipab.22web.org/74194856063.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/ijAgjQk/pvp_ragdoll_simulator_2_codes.pdfIn PDF document text
    • https://tuziroxakitisa.weebly.com/uploads/1/3/4/6/134613497/af59596525da254.pdfIn PDF document text
    • https://pevapulef.weebly.com/uploads/1/3/5/9/135979240/442886243f5.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/f84e7cfb-bc96-43dd-b87a-a2931c5df8e6/realtor_code_of_ethics_protected_classes.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/karvy_mutual_fund_service_request_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f163e6-edc3-4478-a467-29b0f9719add/25560816414.pdfIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_fd9c4123e7ba4040b7d16714523b5468.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kewakuko/no_matter_the_wreckage_table_of_contents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/008236a3-5df4-4758-a68e-aa916a376e4b/40006859443.pdfIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_5738b118ecb541e09d255bf3fa4030ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/honor_8x_amazon_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/57829623234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a9c97dc-4dff-438a-a551-7a59477b37d0/why_my_logitech_mouse_is_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e738b73-b3b0-4550-a81c-b3ebe3d42111/what_is_100_kg_m3.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/69816683139.pdfIn PDF document text
    • http://dajidagetulawu.epizy.com/scantron_performance_achievement_series.pdfIn PDF document text
    • http://katosijuxemewex.rf.gd/bujora.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_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 5940 bytes
SHA-256: e74f2708925220963226a9ab94b9c12753f2944a45dc3d2d655a84508891d440
font_01_sfnt_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 10528 bytes
SHA-256: 9f92ac38f1f4603cd07f12309502ecb8a1e7d35e4660a78961a5e1502ddf698e