Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4f66df894cf47b…

MALICIOUS

PDF

72.3 KB Created: 2021-02-15 05:03:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 03dce9cc22b991e6918be12a334f01b7 SHA-1: fdab6ae6f94f68244db15eee85cc4725b001aa57 SHA-256: fb4f66df894cf47b11f82ddf696394db718cd8f42b8db558028280d01a5cf8fd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially corrupted, suggests a lure related to educational worksheets, which is a common tactic for distributing malicious content.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/wb?keyword=distance%20between%202%20points%20using%20pythagorean%20worksheet PDF link annotation
    • https://cdn.sqhk.co/jidobimatu/hRPCZnT/dan_the_man_game_download.pdfIn PDF document text
    • https://jefamozalubibul.weebly.com/uploads/1/3/1/4/131438275/zevomisigakeke.pdfIn PDF document text
    • http://creampiepow.club/avast_license_file_2017_free7pzu8.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/pekedirisapidoga0oqn6.pdfIn PDF document text
    • https://cdn.sqhk.co/rijakobebux/etxnmjg/87901407878.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/jcjbiim/petosizezozarowira.pdfIn PDF document text
    • http://xrootunited.com/anime_twist_apke7wxh.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/UyBqhbR/zevijoluvonado.pdfIn PDF document text
    • https://mopotiwifatuge.weebly.com/uploads/1/3/0/8/130813373/d5ac25.pdfIn PDF document text
    • http://shop-you.xyz/h_and_m_clothing_store_near_me2859x.pdfIn PDF document text
    • https://rigivopamakor.weebly.com/uploads/1/3/4/8/134869382/jedabibifi.pdfIn PDF document text
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/lofetiku.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/lejivugeleguwod/android_phone_file_transfer_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/xiribotunekudejizijumasek.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/fishing_report_frankfort_michigan.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/bitifip.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/real_football_games_for_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/73041775986.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/65226166692.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_off0000d8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DE 5692 bytes
SHA-256: 881f7b958f9e1ee57bbded703e68f237c4bf5b39718cef465943a7507287bab8
font_01_sfnt_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 11404 bytes
SHA-256: b02f5391e81f896daf1002bd024acbfa18305955872a31b8a0eb96bcd34865f4

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