Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7bb7d461213538…

MALICIOUS

PDF

79.7 KB Created: 2020-11-26 03:59:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ed1b746e73e55214275aa04f1442888 SHA-1: d6b07b9bfde96fc840cfc888e75c91af1cbaa664 SHA-256: 5c7bb7d46121353833495a43237929d92d45c4eac02f17881aed2d1f4fffb161
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://cctraff.ru/123?utm_term=trigonometry+lial+hornsby+schneider+11th+edition+pdf'. This indicates the document's primary purpose is to redirect users to potentially harmful websites. The presence of numerous embedded links, including one to 'https://s3.amazonaws.com/xipavir/21112630761.pdf', further supports a link-farming or redirection attack pattern. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=trigonometry+lial+hornsby+schneider+11th+edition+pdf
    • https://cdn-cms.f-static.net/uploads/4376374/normal_5fb73d1930910.pdf
    • https://gapigapale.weebly.com/uploads/1/3/4/8/134896702/zekuretaremise-viruve-wadofiwedage.pdf
    • https://cdn-cms.f-static.net/uploads/4414336/normal_5f98fa35a7128.pdf
    • https://rozujefugupag.weebly.com/uploads/1/3/4/0/134017035/winukaruweteli.pdf
    • https://gojodisob.weebly.com/uploads/1/3/4/6/134664442/726283.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xipavir/21112630761.pdf
    • https://uploads.strikinglycdn.com/files/dc1f1bfb-201d-4f27-bd07-aa1556888934/16049779575.pdf
    • https://uploads.strikinglycdn.com/files/81ece995-10c0-488d-b498-7c39f5e6cb48/kagufixiroxij.pdf
    • https://s3.amazonaws.com/midaguvimabof/kikilipupuvokujuxewupu.pdf
    • https://uploads.strikinglycdn.com/files/e87cef41-640a-49eb-b20a-753e27a0361d/61355394620.pdf
    • https://uploads.strikinglycdn.com/files/820e67d6-a2b8-493f-b586-f1044dfaf212/chicken_genetics_gizmo_answers_key.pdf
    • https://uploads.strikinglycdn.com/files/9b0acf89-3740-4a84-bb9c-0ffd57b0211c/nasarowaso.pdf
    • https://uploads.strikinglycdn.com/files/f98d7c19-09cc-470a-924c-b3d59d0e7e42/67606744760.pdf
    • https://uploads.strikinglycdn.com/files/15305458-7388-4e25-94d7-ca63d9644099/hindi_movie_dilwale_full_movie_2015.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8d5.bin
045a42af77a724673193ba2615da2a243d7ab26ad54dbeb6efbca0ea7f38beeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 5812 bytes
font_01_sfnt_off00010c7c.bin
e3712a1fe0932231331f53e86e477a5dea391e36969555152ad53071f54f4bcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7C 10788 bytes

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