Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd8a1e4d1f0c3f4…

MALICIOUS

PDF

85.9 KB Created: 2020-11-25 09:34:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2cd379a01d3584d4d66f982e278ee655 SHA-1: b166fe5ba6e2d2ce8bc476b83fa18184c1bd957f SHA-256: 4dd8a1e4d1f0c3f4e5deb173051fa0dc0424e9dbdfeb5970cdf11d2882838606
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 0.9996

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=route+marker+sign+board PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f98cad6937cb.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/f34faa.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/jipadanezamiwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f891dd83f017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444622/normal_5fa9d01a2b119.pdfIn PDF document text
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/c0c720d6032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446921/normal_5fa18e67c2df7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_5f982dddec74c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_5f8d5ff4654b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460450/normal_5fa14fcb62258.pdfIn PDF document text
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/4597014.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/vezumobigodub/gonalipena.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/80758369333.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 4596 bytes
SHA-256: 4b683a99a58c707c62429691b02e6f337e2a481ea0e1abb6091622f5b75a72ac
font_01_sfnt_off0000feac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAC 5324 bytes
SHA-256: c7ed7734cc5f55cf84d817d4812f32d3130476f96bdbf8e5bf80f09dada1fd42
font_02_sfnt_off000110af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AF 10676 bytes
SHA-256: c457cd9b5d24ccdd96a049d8ede35fd0c353955cd9c3e27bdc4aaffa8ad0262f
font_03_sfnt_off0001355e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355E 16120 bytes
SHA-256: 6e8adb5f58151516789749f8a389a738cda36061fd307d7d70c124267e3867ae

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