Malicious PDF — malware analysis report

Static analysis result for SHA-256 a848e490aa001b4a…

MALICIOUS

PDF

71.8 KB Created: 2021-03-08 05:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d4210e9547754b92ed54182587fdae55 SHA-1: 955004d86aa342a5c46cfdca82dfab6070876664 SHA-256: a848e490aa001b4ae4c9ebe04cf3c311248a487dc35e22d24f10ae908026dbe3
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/wix?keyword=mini+cooper+bentley+service+manual+r55+r56+r57+r58+r59 PDF link annotation
    • https://xifugewelude.weebly.com/uploads/1/3/4/3/134353264/buvaxenakubuge.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/cbse_6th_class_maths_textbook_solutions_in_hindi.pdfIn PDF document text
    • https://nufujemirifo.weebly.com/uploads/1/3/4/8/134868255/2246704.pdfIn PDF document text
    • https://motefeka.weebly.com/uploads/1/3/4/1/134108707/rikonasanofana-nitirogemaralat-mebelavafisefef-nevowexif.pdfIn PDF document text
    • https://munelexogetajax.weebly.com/uploads/1/3/1/4/131437313/9917694.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/60693234946.pdfIn PDF document text
    • https://busejupeguwija.weebly.com/uploads/1/3/0/7/130740624/pegimiw.pdfIn PDF document text
    • https://ruwalabipuges.weebly.com/uploads/1/3/4/4/134465281/vevoraretov.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/xajazu.pdfIn PDF document text
    • https://jefiwoso.weebly.com/uploads/1/3/5/9/135996081/2682f2.pdfIn PDF document text
    • http://silekutum.medianewsonline.com/24874524865.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_18a7ca5e5adb44098dc1215027d91cdc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d023291-71fd-4a04-b58b-7342efd687eb/parrot_in_the_oven_chapter_1.pdfIn PDF document text
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_176bee6b2ad84c65b0188daaf8f03d34.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21dbb8df-5871-47d5-989a-70b9ac136ef8/what_is_the_fifth_step_of_aa.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/how_to_use_the_samsung_remote_control.pdfIn PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_175492a023484d79abae920af8b2d1da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6a1b36a-0e82-4871-8043-0950e4946c19/51701393674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41f96696-b3c0-4c03-81f4-827ff0f7e831/32996057795.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_off0000d142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD142 6092 bytes
SHA-256: 5c8fcafbd6c54336f29106f957f8a006eda0a4f58dbd4a6a4a37f55700210619
font_01_sfnt_off0000e5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FA 13496 bytes
SHA-256: b50f378535f1d13280d02cbd9b551bc75c1fb0afc257b8bf5a1fb4da49f45d29

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