Malicious PDF — malware analysis report

Static analysis result for SHA-256 40205f0c7f5d5adc…

MALICIOUS

PDF

76.3 KB Created: 2021-04-27 01:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8b4affc8521106ab4e8cb2978e1a9731 SHA-1: 9974976dd544794be3fa0ba31681cabbabfae456 SHA-256: 40205f0c7f5d5adca29cfa7333161ee413f6da0f0fc357683b8b64ecb83fbe72
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://botokaw.ru/strik?utm_term=norma+iso+27001+pdf+espa%25C3%25B1ol+2017 PDF link annotation
    • http://tafagejiveduda.22web.org/gigofikalepewava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468534/normal_6016e1a72344e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379377/normal_5feb96be86981.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/EIgi4ge/66693674429.pdfIn PDF document text
    • https://cdn.sqhk.co/jotoselu/jijexij/jobedafotukogesuna.pdfIn PDF document text
    • http://wavepolabipal.22web.org/pearson_mastering_physics_homework_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/tjjgeiJ/94615039332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376629/normal_603fe220d1b57.pdfIn PDF document text
    • http://lumolowopixu.iblogger.org/33382523513.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_6bad991a64b9407c84728ad23b489344.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/gezise.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/nanunuwowosevupef.pdfIn PDF document text
    • http://gowokuvatudo.rf.gd/3_basic_principles_of_accounting.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_f185fbd5ea1e45f5baf3ef8bb490efb2.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_off0000e8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 5772 bytes
SHA-256: 8d5220494c7f02145dd9219feabcab5fa9861de1a61ff925a694a9d873838afc
font_01_sfnt_off0000fc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 11580 bytes
SHA-256: c8143c494eca25249c4f1583cf8cb9cf011e6b8893f5d408d79dfd38e2c44503

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