Malicious PDF — malware analysis report

Static analysis result for SHA-256 c972769fec705962…

MALICIOUS

PDF

77.0 KB Created: 2020-11-20 09:21:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2348477a9f642ec4cc1a5a12aceaf9ba SHA-1: 2da36ef9050a492efb322d4ca996b3989534d4a0 SHA-256: c972769fec705962f695583bcceba38ab4dd857fb3ba55cfd9a3b9ad05e1a1b1
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=abo+blood+types+worksheet+answers In PDF document text
    • https://balomufe.weebly.com/uploads/1/3/4/5/134594694/rewujukadub.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/jezaxojipevu/wuxudupuvajudux.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/dimulorizukupexaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aafefa3e-83ab-4c24-82ef-3e41a5a07d84/hp_100_mobile_printer_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ec07bd-8ae6-4fe8-a6d0-c241408ed29e/zombie_tsunami_unlimited_diamonds_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5829e779-4697-41df-87a4-594ad50baf78/15567063376.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/93702054884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a28b97-e553-44d8-a77f-dc3ed60d3a32/88602544383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/464fd0dd-f9c1-4565-a866-04d6a242a6c9/49274860348.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/body_cavities_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 5432 bytes
SHA-256: 423cc29cbcdd156347f5483b9eaacc478d94655e5fc43152e235d44d68348cab
font_01_sfnt_off0000ea53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA53 11724 bytes
SHA-256: d98c82f602b898ca14708e8ba27ab3608f6edf05ecf44c44a43bbfb99ca0415b
font_02_sfnt_off000111e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E6 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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