Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ac11c0b3a70dec…

MALICIOUS

PDF

72.5 KB Created: 2020-12-03 14:01:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 90936466d974ede892bacf8b1576d31c SHA-1: cdfcf33b8531b658d2ed2d448d47a23a7d90d788 SHA-256: 65ac11c0b3a70dec2e80d432a29c3ef822ab9a308b52953fdd6b77413ac1d78a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to PDF generation and a title that appears to be a lure.

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://traffset.ru/123?utm_term=in+a+pit+with+a+lion+on+a+snowy+day+pdf PDF link annotation
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/60f9f.pdfIn PDF document text
    • https://gokipeko.weebly.com/uploads/1/3/4/3/134351508/9cb08f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5f9c93882b0d9.pdfIn PDF document text
    • https://sexozorojupur.weebly.com/uploads/1/3/4/3/134390270/c737478.pdfIn PDF document text
    • https://karozazosepi.weebly.com/uploads/1/3/4/3/134316788/675ab47b.pdfIn PDF document text
    • https://pepigapipewoma.weebly.com/uploads/1/3/4/0/134000130/d0e93623382ff.pdfIn PDF document text
    • https://fewidatemuvej.weebly.com/uploads/1/3/4/2/134266352/4229276.pdfIn PDF document text
    • https://kibejopabut.weebly.com/uploads/1/3/4/8/134884539/5235222.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/fec7320a-2b5a-4834-ad79-c64c64f255ec/9apps_free_download_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/49271025687.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/zetutotesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b6fb90-28d1-4cd9-8aec-6eca0ad1f6da/luvokesudorenes.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/astm_c39.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B4 5164 bytes
SHA-256: ad2e7a7dfeebf809c570b0af00af32de1868355836f8ffa3388709628c8c117d
font_01_sfnt_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 13012 bytes
SHA-256: 9f5866358ab3c3b36a5985a4d0daf9f7c3c570bb30fb920c7ec30aa37dea5df3

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