Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a24ef7ba0b4a85…

MALICIOUS

PDF

64.9 KB Created: 2021-01-31 11:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ceee1f08b884862f6bd4ad7a0cb2298b SHA-1: ee787869b3f14395665716013aca749a84f9f878 SHA-256: d9a24ef7ba0b4a859861f63368e67b712fafba47a7ee420ecbcfe9cd5007af3b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with a critical heuristic firing for PDF_SEO_LINK_FARM. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high probability of malicious intent. While no scripts were extracted, the sheer volume of outbound links suggests an attempt to manipulate search engine results or distribute malicious content through these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://druttle.ru/123?utm_term=larue+scope+mount+qd+lt104 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427499/normal_5fe80bb6d32c7.pdfIn PDF document text
    • https://vuminuzatadabem.weebly.com/uploads/1/3/4/3/134311796/nolefoliwofu_bexalamaf_zedelivan.pdfIn PDF document text
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/taweneguvow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459466/normal_5ff170b329606.pdfIn PDF document text
    • https://cdn.sqhk.co/felinavaw/ymhyifl/rawapanikeliwowajabit.pdfIn PDF document text
    • https://sazefowefojewen.weebly.com/uploads/1/3/4/8/134893887/zepanitosiripafef.pdfIn PDF document text
    • https://kusafulidofet.weebly.com/uploads/1/3/4/0/134017607/timamaj_mifavuf_vefajixapaja.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/vuzepar_nasomoni_xagokopemone_xogebikun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475212/normal_60029d319f44d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475406/normal_5fd7eb864c284.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403951/normal_5fcdaa609aae5.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/ig3Jf19/desawegexu.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/fukezavazuj/type_of_computer_network.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/cartoon_video_hd_mp4.pdfIn PDF document text
    • http://zusewijoje.epizy.com/8295929055.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/ederson_clean_sheets_epl.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_off0000c076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC076 5568 bytes
SHA-256: cd58d0742a0d2a81c4f424e0cdc745671d3f78c14b35cbe2bacd75c283eef7a7
font_01_sfnt_off0000d357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD357 10552 bytes
SHA-256: 79d29917a5ea99bc79fa9248e50f51f131f4d43f1c7d8db8b16f4139b03773d6

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