Malicious PDF — malware analysis report

Static analysis result for SHA-256 3271aa38b9baa571…

MALICIOUS

PDF

71.4 KB Created: 2020-12-18 16:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2378b93236c0208f46c6408f6df49d34 SHA-1: 2673f5dc8e4867edca396ecb694228c809189c1d SHA-256: 3271aa38b9baa571dc44a80d211ce5f050025e1c7be802eaf490ba8935f55426
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or trojan distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/strik?utm_term=advanced+bionics+recall PDF link annotation
    • https://wenozujilemufo.weebly.com/uploads/1/3/4/4/134456287/cb2c3ed3098d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388819/normal_5f98a4de90b41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f95b38197af9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497093/normal_5fd03e81ab4bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_5fd241861d309.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/5fce0cb456a976706ec4a1d5/t/5fd02ccfa94600575874f5c5/1607478480421/download_fin_ancient_mystery_adventure_platformer_mod.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc79b839866a15ab3def02/t/5fdcaf86537961045029d92e/1608298374817/cranberries_singer_autopsy_report.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf64244f98375720d84d19/1606378536824/6286219978.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc81a80526ad1a5999a26b/t/5fdcbc423f4cde091ae1eda9/1608301635203/pubg_mobile_lite_hack_script.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/18578459526.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/taking_responsibility_worksheets.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2ec1b7848ba205d25c866/t/5fc53ff13f75b166437f791e/1606762483761/zunoxejis.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_off0000daf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF5 5124 bytes
SHA-256: ec9187c7602c3a4858ce894ca97cf55726ae7e1cf06103bf170723aedf8861ae
font_01_sfnt_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 10680 bytes
SHA-256: 9d7a57976147afe5d9193fade6571ce989b00fbcb4c6a4e7b2bf49322572d85d

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