Malicious PDF — malware analysis report

Static analysis result for SHA-256 97cd16e078a5eed1…

MALICIOUS

PDF

67.0 KB Created: 2021-06-10 10:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cbe722c16192213c4344238c70466447 SHA-1: b445433894acab27193b36a16cddb36c0266eaf7 SHA-256: 97cd16e078a5eed1dba851fa727136f6ea2519b35dc232cd851ba2eebb2863a1
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-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://vilenefex.ru/123?utm_term=anson+seabra+broken PDF link annotation
    • https://garusase.weebly.com/uploads/1/3/4/6/134634063/3627636.pdfIn PDF document text
    • https://tunikasas.weebly.com/uploads/1/3/1/4/131438809/62772.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426697/normal_5fcf5842046bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_6029cfb856657.pdfIn PDF document text
    • https://nuwoveforu.weebly.com/uploads/1/3/4/0/134099073/1822ecf3b691a.pdfIn PDF document text
    • https://bejidadona.weebly.com/uploads/1/3/0/9/130969139/5356833.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369313/normal_5feea13240727.pdfIn PDF document text
    • https://duxizesojisuvab.weebly.com/uploads/1/3/5/3/135327590/5948d784.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414682/normal_5fc6840fdb1d2.pdfIn PDF document text
    • https://kexofoxofoxo.weebly.com/uploads/1/3/5/3/135318322/371d4b473829b.pdfIn PDF document text
    • https://dotolisode.weebly.com/uploads/1/3/4/6/134616401/kutoginanubifox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374373/normal_5fc692f032d7b.pdfIn PDF document text
    • https://ririzunok.weebly.com/uploads/1/3/4/7/134712782/6f1689.pdfIn PDF document text
    • https://vudeberas.weebly.com/uploads/1/3/3/9/133997553/wuzanunika.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459029/normal_5ff75fd58356d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483864/normal_5feb99c78b75f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381534/normal_60461af573491.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepigiwup.pbworks.com/f/ark_how_to_increase_taming_effectiveness.pdfIn PDF document text
    • http://piwazufoli.pbworks.com/w/file/fetch/144751752/coreldraw_x6_free_download_full_version_with_crack_for_windows_10.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/f/how_do_i_connect_my_ipad_to_my_brother_printer_label.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_off0000c9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F9 4840 bytes
SHA-256: f6ce9fae392bfaa2c0432b1dc0c29d89a7429b5d0505cf32edd9ba50b594b825
font_01_sfnt_off0000da80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA80 10320 bytes
SHA-256: 3fc6250ea3190e647712bae15c9b3cdadc2de54f2ce2e7fa06178dcf949ab9e6

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