Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9724c873a3adff5…

MALICIOUS

PDF

72.8 KB Created: 2020-12-08 03:30:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 23f8ef49bc01d15f7c0b40cad3a9e8e0 SHA-1: 90f4cb1ad47444f65b0a9b785fc1bcc812548a43 SHA-256: f9724c873a3adff556e640e143c84523af233d1b84a8c128bd8a3fd2b025eb31
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 0.9998

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
  • 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://traffset.ru/strik?utm_term=corresponding+angles+theorem+proof PDF link annotation
    • https://tenetowebobidiv.weebly.com/uploads/1/3/4/6/134635535/982d21b2.pdfIn PDF document text
    • https://fufagefi.weebly.com/uploads/1/3/4/6/134638184/1116548.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470228/normal_5fc43fcfb060d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375352/normal_5fc4fa4b6c627.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/5fc58f801452f90b7f04b470/t/5fc9475b06fbdb4daab0a725/1607026523206/double_cream_cake_decoration.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd06123fdc31513a10e5ac/1606223378910/dezam.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3d0288139af0376575e17/t/5fc46c4ff81c9a2a0c2ff6c0/1606708304852/peer_support_group_facilitator_training__student_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/crafting_and_building_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53b3e8e9-a375-401c-a9f4-e1603aa1efa8/87432079399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/200215e2-f2ea-4e2c-8dc4-5f12b6e28d5d/xowevagizawu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4985e18c5c478ef1f2fb/1606371717873/cricut_easypress_mini_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/90017699148.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/exclusivity_contract_template_uk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc066bd9955c744b5390948/t/5fc2c1f0bc819f1cf433a0fd/1606599153726/daniel_gilbert_stumbling_on_happiness.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc15943ea4a794d56482977/t/5fc5dffe3570fb44d1ce29d2/1606803455127/resox.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_off0000c8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CA 5360 bytes
SHA-256: a9c1c01d6cb1aa2b52b82aea0595e66135ece024915596606782c3714112f055
font_01_sfnt_off0000dad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD5 10988 bytes
SHA-256: c817bc1547488aef02f93a5cb4e83e77d325e77c46984a1fc94e44e368a37d62
font_02_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 16208 bytes
SHA-256: c668340ea348c6c31d5e51383644f9376ddb5abab10fc4a31907679951a3ddda

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