Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f31540815b6372…

MALICIOUS

PDF

80.0 KB Created: 2021-02-22 00:12:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87ea43cd53ef6b05bde64de74b466f07 SHA-1: 1f1656c85494ae17f6de883adbada12915c092c6 SHA-256: 02f31540815b6372c272b1ec8897a22abb54cb8d8f22c841fd2b8a64451b682f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm designed to manipulate search engine results and lure victims. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wix?keyword=california+association+of+realtors+forms+download
    • https://jufozovujibozom.weebly.com/uploads/1/3/4/3/134360308/2997898.pdf
    • http://rutidewebatodug.iblogger.org/sketchup_free_online_2d.pdf
    • https://cdn-cms.f-static.net/uploads/4444626/normal_5fe81c0ad4e35.pdf
    • https://cdn-cms.f-static.net/uploads/4459624/normal_5fd85595d2b78.pdf
    • https://zewemoledomuro.weebly.com/uploads/1/3/4/7/134746436/3430603.pdf
    • https://xupajipodiburut.weebly.com/uploads/1/3/0/8/130814024/4438931.pdf
    • https://kibidabusiben.weebly.com/uploads/1/3/1/0/131070702/3712934.pdf
    • https://static.s123-cdn-static.com/uploads/4455894/normal_6005e1f2a6ca8.pdf
    • https://static.s123-cdn-static.com/uploads/4425501/normal_60028b61e3954.pdf
    • https://kuxokovu.weebly.com/uploads/1/3/0/7/130738635/pepugojijigiti_lidirimonowo_tipobog.pdf
    • https://xoxopurotawasuj.weebly.com/uploads/1/3/4/6/134651309/jiziwopejibodo.pdf
    • https://lurenejaxerugu.weebly.com/uploads/1/3/4/7/134728533/tonut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/titugome/70098017891.pdf
    • http://tekunobujolid.epizy.com/9204070295.pdf
    • http://dadosekim.epizy.com/furaxoxupotoxize.pdf
    • https://s3.amazonaws.com/mogipegi/mopisitagapub.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edba.bin
6ca333d9f75e14aeed8439a24973700ac790d7ef5fbf9eebc46e8e3a2b848c2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 5068 bytes
font_01_sfnt_off0000fee9.bin
ceab5c4f97ac4b4feaf6e17c376eda5388dc057fb51b3d52b0f81c69ac7eb58f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE9 10800 bytes
font_02_sfnt_off000123e7.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123E7 4324 bytes

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