Malicious PDF — malware analysis report

Static analysis result for SHA-256 6103e640a45c06be…

MALICIOUS

PDF

72.6 KB Created: 2021-06-05 00:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d5d1356e9e7b1131db297f852474920f SHA-1: 66bbeca20c7fd9d5ef7193158c2105fed641b476 SHA-256: 6103e640a45c06beb20bd01c81e2cddf16f11922a8d539ad71265a4b56a51090
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL leading to 'garglob.ru' which is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious content, specifically identified as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to an 'American english file' answer key, suggesting a lure for phishing or malware download.

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://garglob.ru/pbw?utm_term=american+english+file+5+second+edition+answer+key+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502906/normal_60ba94a20f125.pdfIn PDF document text
    • https://vijekufimukij.weebly.com/uploads/1/3/0/9/130969895/vonoduragurar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388285/normal_606e050edb5d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481839/normal_5fe4c65687357.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374859/normal_5ffec0780836e.pdfIn PDF document text
    • https://latabiwot.weebly.com/uploads/1/3/4/6/134612911/3143740.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497093/normal_5fd03ef09822d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451753/normal_5fd90831ad2f6.pdfIn PDF document text
    • https://nebunabimumebu.weebly.com/uploads/1/3/4/4/134480995/xurat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464850/normal_603e9b8a0bded.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4481270/normal_60afff3c7837e.pdfIn PDF document text
    • https://zikowipon.weebly.com/uploads/1/3/5/3/135300096/wolewabizanikan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448985/normal_603429c71a089.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/c5cf8c2e-ae6b-4a72-ae38-53bf833079ed/english_file_3rd_edition_advanced_teachers_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/480e343a-d764-4197-990f-1809c8257d3c/the_maze_runner_2014_movie_download_in_hindi_720p_bolly4u.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e69bd7f1-a2fd-42fe-aeb7-9c9ab73bd8cf/lujijunamotojimomulafikiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63056eb4-f67a-40d1-b259-634a801466ef/latejebiwiwijidoloki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86ada9d3-f19a-4685-a376-2d17f2d61243/code_of_canon_law_on_marriage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d4ff17a-7da0-46aa-8029-cf9f6097f46d/zolomadowofexajes.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_off0000db61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 5940 bytes
SHA-256: 105d41787d74b6c3417f9e4bdd2762ca0573bff7d3e60065f88ce913942b4b0f
font_01_sfnt_off0000ef8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 10988 bytes
SHA-256: 8256eab624f70395128b41454433906948a43283cea53093ee52c2644bff4d4a

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