Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0162f70510368f4…

MALICIOUS

PDF

74.8 KB Created: 2021-03-21 08:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 448131f3df93eae6f1c25e593a8b5328 SHA-1: d461d1ca6b652c4b655a9935113152c33638fd90 SHA-256: d0162f70510368f4119bba3e36b31733ebfcfd2cb844acdf497aa6c6142463ef
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to audio equipment comparisons, directing users to suspicious URLs like https://golowaki.ru/strik?utm_term=oppo+105+vs+205+sound+quality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=oppo+105+vs+205+sound+quality PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451555/normal_5ff90f48a2317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420248/normal_6041929529381.pdfIn PDF document text
    • https://cdn.sqhk.co/votijavos/Nhdjbjg/ducks_unlimited_calendar_2021_minnesota.pdfIn PDF document text
    • http://kewotij.mypressonline.com/90597159962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412584/normal_604dd24a39114.pdfIn PDF document text
    • http://serawuv.mygamesonline.org/java_programming_for_beginners_by_krishna_rungta.pdfIn PDF document text
    • https://welirupew.weebly.com/uploads/1/3/4/6/134662060/dogef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445731/normal_600618622cef3.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/99334373109.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/jdgfWnv/49129705246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420237/normal_6055265438b2e.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/xapolixu.pdfIn PDF document text
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/tikerawita.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/bomupi/what_is_relation_between_mean_median_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/pexinazopudedosuvajasevez.pdfIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_7ff9b09595284b8db2bf07ec80dcf6d6.pdf?index=trueIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_7bf5a3f518b249958b492daba1132000.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezutu/amazon_app_apk_old_version.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/certificate_format_for_internship_project_report.pdfIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_6ccca39558c04d8084a9906fd734c83b.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_off0000e5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B1 5624 bytes
SHA-256: d1bf434235af2b77699d0b3734c655c43aaf4a4fde5e0fd1496805483b58e61c
font_01_sfnt_off0000f8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 10796 bytes
SHA-256: 9aef49679c3f648fb9468c0aef36660c91f643fda793335bc26e0091bd80f398

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