Malicious PDF — malware analysis report

Static analysis result for SHA-256 760cad1aa6f51971…

MALICIOUS

PDF

76.0 KB Created: 2020-12-16 20:09:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d9617e9dc5e8a84e480dd6327ba2993a SHA-1: 962a26348de22641897071d176a69c1b1d0c5706 SHA-256: 760cad1aa6f5197128d1c337bf6206e9aed3ab63da0829d6ed90eef8d4c53f65
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://trafffe.ru/strik?utm_term=1880+morgan+silver+dollar+cc PDF link annotation
    • https://lepatoketi.weebly.com/uploads/1/3/4/7/134732542/9586f21a2fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501660/normal_5fc79d08deb90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407304/normal_5fd65e55a5055.pdfIn PDF document text
    • https://deremorukoj.weebly.com/uploads/1/3/4/4/134490203/vokowikes.pdfIn PDF document text
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/ramenebonogamiwexa.pdfIn PDF document text
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/1b389cb7917.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402944/normal_5f911280a4ff6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488822/normal_5fc2259562411.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/libusamagowuvo/queens_college_library_staff.pdfIn PDF document text
    • https://s3.amazonaws.com/pusumowi/fokikefuwunigovukeru.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/limits_and_continuity_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/ramererefuvidit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fffa058-3af3-47c1-8313-f8f29604858d/what_is_a_verified_resale_ticket_nba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb441d2f-12f3-43f3-972e-c9c799fcaf3a/11526536840.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B0 5612 bytes
SHA-256: f5ebdc5e922ea3a530652688f089a13bb0f493bf6098df8cb9a84d84e0d8b6a9
font_01_sfnt_off0000e8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BE 10836 bytes
SHA-256: 74ef8e97003e5f7bc43a7b4bf76f3b84f1eeb5aa1ec72416d449a200032d3380
font_02_sfnt_off00010e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E39 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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