Malicious PDF — malware analysis report

Static analysis result for SHA-256 9741f396ad32fd77…

MALICIOUS

PDF

79.0 KB Created: 2020-11-22 07:14:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5bdebf8f42e630ea7a2452ccd990c25b SHA-1: 1e52ad341a2e7443906017c3503aecfee49b8535 SHA-256: 9741f396ad32fd77741cd8a0b05448a613d063889cc77b1178754bca6a26a148
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 0.9997

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://traffnew.ru/123?utm_term=ap+physics+c+mechanics+vs+electricity+and+magnetism PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470964/normal_5faddb5f6aff6.pdfIn PDF document text
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/tereretizexodel-kimogowepojige.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375884/normal_5f8c162a5cfb6.pdfIn PDF document text
    • https://wotuvakarebor.weebly.com/uploads/1/3/4/6/134665633/losevo-kuvurabalojaru-fetofisafotik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5f8cb242a10b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/554638a7-e6af-4041-84a8-7011bcd151e0/31705065394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f0d8a4-b217-4e86-aaa7-c88b558f7b4c/15906077920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07f3a2dc-a7a0-417c-9ce6-e93a8da5e069/busiralixemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e5f78a4-cc07-4950-a6f1-4b6c6c68b24f/31189316589.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/honda_crv_2018_android_auto_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/nenel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a632434-a47f-464b-ac05-dd37132d60de/89674339977.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_off0000f6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 5640 bytes
SHA-256: dc695e626e8870953314335dae9c726af48d1819abf91f160871a13151a8398a
font_01_sfnt_off000109e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 10988 bytes
SHA-256: 8f9827374b04a86ef4adb9a271d49dfcbdeb1e85ad83a2788cbbb657e63df6ef

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