Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf414d7ef8a711b…

MALICIOUS

PDF

113.0 KB Created: 2021-02-28 00:55:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e5c8284c364f9c72dee7fa7b67a0de3f SHA-1: b50d031397be88ee9d00c7b7b5854b71d0462adc SHA-256: 3bf414d7ef8a711b4c286e0b74b9fbc8f95c1b779df2fe4749b4d22fe701dd52
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a lure related to 'direct democracy' and a high-risk heuristic indicating an SEO redirector for phishing. The embedded URL, https://maypoin.ru/strik?utm_term=what+defines+a+direct+democracy, is identified as a redirector likely leading to a phishing page. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing attack delivered via a document attachment.

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://maypoin.ru/strik?utm_term=what+defines+a+direct+democracy PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464878/normal_5fe542c9d4a29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487416/normal_60278234d1fee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403141/normal_600b38fe4d796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_5fd2721718832.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483388/normal_5ff0c235ca194.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420752/normal_5fce4cfcefd67.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/jazofi/71911297776.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/sakhi_songs_tamil_free.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/96558297754.pdfIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/is_sudden_high_blood_pressure_a_symptom_of_covid_19.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/westinghouse_32_led_tv_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/19173186315.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/statistical_process_control_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/luvopozikab.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/xukijenebasivazum.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_off00017337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17337 5132 bytes
SHA-256: 9944cad9ec8af2d6ddba213cffa7cdb8e84d987113580ef949b58ff027043d99
font_01_sfnt_off00018485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18485 10796 bytes
SHA-256: ae55899af8e420871c577e6521fec376e3ceb001a92f0f4bcd390a0822d86e00
font_02_sfnt_off0001a8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8C4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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