Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85bd607fd9ce7d7…

MALICIOUS

PDF

76.2 KB Created: 2021-02-19 09:48:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ad59e4d6994042cb7161517a6c70c9b5 SHA-1: a7459b3ef1237c2d9f8637f24c82447f19ba4b50 SHA-256: d85bd607fd9ce7d7e2040b2bc8da32895b2a1d1f1f0eef919ff93760a5c0b761
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://seumenha.ru/wix?keyword=eleventh+hour+cissp+study+guide+4th+edition+pdf+download', indicates a lure related to a study guide. While no scripts were explicitly extracted, the PDF structure and the high ML classifier score strongly suggest malicious intent, likely to redirect users to malicious sites or download further malware.

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://seumenha.ru/wix?keyword=eleventh+hour+cissp+study+guide+4th+edition+pdf+download PDF link annotation
    • http://afterdealer.pro/759233641509kho6.pdfIn PDF document text
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/51578.pdfIn PDF document text
    • https://bumiwawewa.weebly.com/uploads/1/3/5/3/135343946/jadap-kalewiretivut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489440/normal_5ff81e0760e76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377125/normal_6007535c090f6.pdfIn PDF document text
    • https://sowibize.weebly.com/uploads/1/3/5/3/135348762/semaropusumuta_forukonujugivaf.pdfIn PDF document text
    • https://risimomumet.weebly.com/uploads/1/3/0/8/130814588/7562100.pdfIn PDF document text
    • http://arendaavto.taxi/trapped_in_the_forest_free_downloadx47ek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484609/normal_5ff1d41db062d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366045/normal_600643a31d6b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417206/normal_5fd05e1728a2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424982/normal_6003696f53698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422133/normal_5fd0fee26ff13.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/wezukep/82929342491.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/cbse_topper_2019_class_12_marksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/kuxobesefakam.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/dijufexonaduxukenupuz.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/junosukijuni.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_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 5716 bytes
SHA-256: 4c2b6bcab959ae32da6a0c04ae23beed4ee3e68c76eebd6d2f8f71aaa05625b3
font_01_sfnt_off0000febf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBF 10688 bytes
SHA-256: 15493cd9ef6f218038a30168489ba1c078a3f18e88d3f1a90bcbda94e5eae5b7

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