Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c35e17f6b0888ee…

MALICIOUS

PDF

70.4 KB Created: 2020-12-16 08:18:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ed264957aaf62ad6c73a5e6822005180 SHA-1: 1d1ac8eade2cb76e8fe3e42d9573a35485886674 SHA-256: 3c35e17f6b0888ee13a24d64b3d3def6957517e58a0ecbabb353da561520eb86
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector service designed to lead users to malicious content. The primary malicious URL identified is a redirector that appears to be part of a link farm strategy, likely intended to phish for credentials or deliver further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • 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=ap+biology+bacterial+transformation+lab+answers In PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/6865523.pdfIn PDF document text
    • https://metojonokodoto.weebly.com/uploads/1/3/4/8/134881876/luzafakewurafo_dubobifo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/170fcc51-1c64-4688-b0a9-aa92af7cd9d0/51216775209.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe005418e72e5fdb9d43e7/1606287445363/tofufudewit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97dc8e27-1504-4731-8dfb-f9cfad37e7f3/how_to_cite_images_with_apa_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec0cf15b-d3e5-463e-88b4-f8dfe60f086a/three_button_suit_bow_tie.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/by_water_and_the_spirit_umc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6038a861-1fd6-4cb1-88ee-a0e588cba139/40159880804.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5313f104edf1d779d1ce4/t/5fcc9805d336b863f0bcfea3/1607243784421/my_club_wyndham_app.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc539b8ab79f442f245deff/t/5fd00ee53e94b40d038c0a05/1607470822879/tesazozutunuligesiwidu.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/alesis_sr-_16_drum_machine_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc17674e9fc3622d5261a8e/t/5fcef4cd57846c5b834a3204/1607398606628/mikunaf.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/89867365258.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/britannica_learning_books.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/maplestory_2_thief_guide_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/zibubaz.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_off0000d6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AF 5660 bytes
SHA-256: 32418338865c1e30bc66905cf1b21d9591993522f71022e50aca2bbf9b4ca2ae
font_01_sfnt_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 10052 bytes
SHA-256: 02526db5f8cc792564ffbfcbb56640d4c8d3ef7131a135ceb9c6bc7ddaef875f

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