Malicious PDF — malware analysis report

Static analysis result for SHA-256 470312c3f3a3a2d0…

MALICIOUS

PDF

66.4 KB Created: 2021-02-19 18:46:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d50d1b921945ab44edd008b5cf9b9b56 SHA-1: 9ff07576f3b6a8a914c99d0e669dde87b2567829 SHA-256: 470312c3f3a3a2d009fa5678d0e6ed47ca6b460465955335b358464a688b2825
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a link to a known malicious redirector, 'https://yafferge.ru/123?utm_term=finite+and+nonfinite+verbs+exercises+with+answers+for+class+7', which is likely used to deliver a secondary payload or phish for credentials. The document body, though partially corrupted, suggests a lure related to educational exercises.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/123?utm_term=finite+and+nonfinite+verbs+exercises+with+answers+for+class+7 In PDF document text
    • https://cdn.sqhk.co/zolewiko/iagjXjj/chocolate_cake_recipe_without_egg_hebbars_kitchen.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/igeghiQ/widoxelisamebezujugulu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465537/normal_5fdeafc7b94ee.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/fqTifZq/unlimited_dynamons_world_game_download.pdfIn PDF document text
    • http://chambre.xyz/jevarovidatewuzurafijevacgcf.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/MbMhhIH/gowumajobizewex.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/gXIFy2C/meadow_blazing_star_liatris.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/MThcr47/41979756555.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/nhfhggi/83209663183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382408/normal_5fdc3a8fd3f4c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/verirejon/last_tango_in_paris_movie_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/gopitaripefitijimoxuv.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/firefox_browser_android_slow.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_off0000c748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC748 5504 bytes
SHA-256: 8e60a59b8809b1ecab19ae40b4a6602f2f3fc67f3be8699bf55bbf63607ebf42
font_01_sfnt_off0000da1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1F 10032 bytes
SHA-256: 30d8d1001cb6b7230e2cf3a8658e4e83741ede4d97179bbbb5a4b393d3c513a8

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