Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f60c3c037375a5f…

MALICIOUS

PDF

72.7 KB Created: 2020-12-17 08:46:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6fe1f590ddad6c350c0dc9f5e986fa00 SHA-1: 9f655d5833627b8eba9c415329a1d602a90bd406 SHA-256: 0f60c3c037375a5f1d25e40fc9aeead30fe90e664a70264eb0917ea0f2da34d5
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate that this PDF is part of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • 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://cctraff.ru/strik?utm_term=probability+board+games+project+ideas In PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/09b03b.pdfIn PDF document text
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/30d1d49601fae34.pdfIn PDF document text
    • https://dubitofux.weebly.com/uploads/1/3/4/4/134458445/suguna.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfb4c6a371610b8775cd3/1606220621810/peter_singers_argument_on_famine_affluence_and_morality.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/manual_of_structural_kinesiology_floyd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08cee65e-9d36-4114-be65-9d04bdc05274/52346962837.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/circular_saw_guide_track_ver._2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/229caf99-18c2-4a3b-8f0b-91f8f6cb0739/the_wait_book_devon_franklin.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/93212599185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/117c47f5-e100-49d4-9a79-df2c13c87337/mr_coffee_dehydrator_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/anjali_anjali_video_song_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1c340b0-fb45-4728-a611-e0f893fcfb73/mods_for_minecraft_pe_apk_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/cabeza_de_turco_gunter_wallraff.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_off0000ddde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 5712 bytes
SHA-256: 7fc021cc478c7b2bc461753671e36ce4becaeecb0d1c3d3b7e71f1b94e16142b
font_01_sfnt_off0000f142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF142 10664 bytes
SHA-256: 04c76df55889e4ecb8e47e9adb4f27bb37dd09a817d79efca7284433dc939034

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