Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f92516321026f12…

MALICIOUS

PDF

74.1 KB Created: 2021-02-14 06:36:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 705154321f43817b6feaf72007911531 SHA-1: 6c3efbc8b4d38ed0d56f66c5abbb934cf51e23a6 SHA-256: 8f92516321026f12d4d139d265cd16afd64ab2168c4d853dd5a600a58dd14a5b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content or downloads. The presence of external URIs and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/wix?keyword=astrill+apk+3.2+download PDF link annotation
    • https://vekeliludodim.weebly.com/uploads/1/3/4/7/134745250/af08fef3ab8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448328/normal_5ffda5174e0bd.pdfIn PDF document text
    • http://ru-payment.casa/690083271015stsz.pdfIn PDF document text
    • http://uchebnoe.website/bartenders_guide_to_the_galaxyhip0v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505699/normal_5fceb38567c9a.pdfIn PDF document text
    • http://lady-bug.club/birthday_images_for_nephew_freesc9s2.pdfIn PDF document text
    • http://belldiscount.ru/radionics_d7412g_programming_manualgayi6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416791/normal_5ff65e4a82817.pdfIn PDF document text
    • http://grenkasalo4.xyz/wexibikokujofalavevekuzox31hz2.pdfIn PDF document text
    • https://mobisikude.weebly.com/uploads/1/3/1/6/131606420/mizuzidufagex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_6024a3eee80e2.pdfIn PDF document text
    • http://mscgis.net/kularakufapinohyq7a.pdfIn PDF document text
    • http://sluzhba1.net/how_to_better_discord_themes83jyy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ligededeju.epizy.com/cisco_ise_low_level_design_template.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_off0000e564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 5424 bytes
SHA-256: 7148c2fc9151bb1fbc125998492025db5689aa9728e38f6a8fe00928f97b75fc
font_01_sfnt_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 10276 bytes
SHA-256: 541edf87d0a0a550b5272ad2fad88d5ebb96da6c50bd23fd18fabbf6471b6c06

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