Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef2b77f85459334…

MALICIOUS

PDF

70.5 KB Created: 2021-02-21 04:30:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d69b3f77a0d24967bcbd923ba13bd720 SHA-1: b155d5505e737feed1fa5ea66bbfc1a425a3ce23 SHA-256: 2ef2b77f85459334eee186decd497eea568facbc71739d2a638ce00d6979a8ac
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is a PDF that contains a lure related to 'keytrain answers' and redirects to the URL 'https://bologen.ru/wix?keyword=keytrain+answers+full'. This URL is flagged as a redirector for phishing, and the ML classifier and ClamAV detection strongly indicate malicious intent. The PDF structure and embedded content suggest it's designed to trick users into visiting the malicious site, likely for credential harvesting or further payload delivery.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/wix?keyword=keytrain+answers+full PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455185/normal_600cb5e3e92c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424405/normal_5fe9fdc628bb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473340/normal_5ff05bdb7eae1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377377/normal_600649d7bdb9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485435/normal_6026933fec78e.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxonavi/EIoWjf0/32807309287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413462/normal_60226973c7d8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368953/normal_5ffba2066a258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421210/normal_60192ef67d7c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383475/normal_5fe0ceca0ef94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383308/normal_5ffffb0bd3134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472783/normal_6028567b3e47b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lanaladu/33476713302.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/fruitport_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/bioscope_apk_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/90671065631.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/wigalexojojejutep.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/sound_booster_for_android_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC49 4696 bytes
SHA-256: 5d4e1419e0557b8b9f997b6ff89f7cb450cb40aa415acd614b9dcfcb7ade8150
font_01_sfnt_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 10016 bytes
SHA-256: 869ee6866d41262a85db51f330aefa82befc4abc3fecd33bcd8b4fd8aba4ec57
font_02_sfnt_off0000feaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAF 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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