Malicious PDF — malware analysis report

Static analysis result for SHA-256 f509bedf63d55db5…

MALICIOUS

PDF

70.8 KB Created: 2021-03-23 00:10:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 1aba2d9862ec1c81348227acf50dbb06 SHA-1: 005114a1e25015fb9523ba3bd9da4c9caf056e86 SHA-256: f509bedf63d55db5358c7a19f298eeb7c90ff64e423e873c5902403c3a77539d
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, one of which points to a suspicious domain ('vilenefex.ru') and is flagged as an external URI. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan. The document body, though partially obfuscated, suggests a lure related to 'grammar exercises'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/123?utm_term=advanced+grammar+exercises+with+answers PDF link annotation
    • http://mujezinej.22web.org/27191580733.pdfIn PDF document text
    • http://kavopiluxum.iblogger.org/pevojewutigamuf.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/how_to_say_ute.pdfIn PDF document text
    • http://luxenerox.22web.org/97840060140.pdfIn PDF document text
    • http://subenoji.iblogger.org/war_and_genocide_bergen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pekomuvave.myartsonline.com/wheel_of_life_assessment.pdfIn PDF document text
    • http://wokixewo.epizy.com/sikesemozobomutir.pdfIn PDF document text
    • http://feselipalez.epizy.com/51450056597.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/sataba.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_77673c52cc7f4a3abc2a6618bcbe5d62.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wunojipu/og_mandino_scrolls_1.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_3ea94d01229b4ffb86c1d12c16748ca8.pdf?index=trueIn PDF document text
    • http://tizepadeda.rf.gd/gmt_full_form_in_english.pdfIn PDF document text
    • http://rugogevegemup.rf.gd/university_of_florida_campus_map.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_eb461c1f25ef4b33a4cf2c5b83cdf47b.pdf?index=trueIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_f48b47bb18c0476d869279056c0f0a0a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/94475556762.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_off0000d576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD576 5528 bytes
SHA-256: 717b2b780403c12559375f8536ee4e14dfd50a51d8f68e7b9a7e27589f0c3e28
font_01_sfnt_off0000e832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 11112 bytes
SHA-256: 1dbfed132253f8cd12dce7f77a39f420aff8b184d8906a02ae8e48bd4844dafa

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