Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33a963ae5e641a6…

MALICIOUS

PDF

76.7 KB Created: 2021-03-24 12:53:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 210bfb2f49b49105d534435004bdbb3b SHA-1: 5b85a8a10412a7f91157f84cf1e45b67bf1d30c0 SHA-256: d33a963ae5e641a69b690f3079b24868e26a9da656f7867b00205ca307f617df
186 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 0.9998

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://soxebez.ru/award?keyword=tutorial+de+autocad+electrical+2020+en+espa%25C3%25B1ol+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493221/normal_602d0426244ef.pdfIn PDF document text
    • https://cdn.sqhk.co/lidupusumoj/cGz9ic2/lego_ninjago_golden_dragon_armor.pdfIn PDF document text
    • https://cdn.sqhk.co/wivesuvuvu/Uhjhahc/79539301888.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/lhcSgjc/bachelor_of_business_administration_salary_in_kenya.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416928/normal_5feb35036a8f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459805/normal_5ff7a351d4751.pdfIn PDF document text
    • https://cdn.sqhk.co/fakodozug/FhdFZic/leatherface_1974_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/wafixagi/jgFbhpo/xitevojikakakajo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385206/normal_5ffe7ac20202a.pdfIn PDF document text
    • https://jixisejilikabow.weebly.com/uploads/1/3/4/2/134265892/9742944.pdfIn PDF document text
    • https://cdn.sqhk.co/savujegu/4qghFH4/run_ninja_run_unblocked_76.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/iTOozjc/xivubeviguwazotu.pdfIn PDF document text
    • https://taleputara.weebly.com/uploads/1/3/4/3/134305900/6296072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464542/normal_603ee75722235.pdfIn PDF document text
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/fagavisumufetug_tubara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493198/normal_5fe6a54fef8b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_84c8632ab9714740842b683219f92899.pdf?index=trueIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_3ade285570344c4e856500d21d705cee.pdf?index=trueIn 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_off0000e91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 5584 bytes
SHA-256: bce13f9b918e38e79998a2558b7d7200dedac6fbf8ea52565afb9b8079f21921
font_01_sfnt_off0000fbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE1 11920 bytes
SHA-256: 5a6cb60841d4af5b538283005c69fb37e28f62a947fec3a8e983e6c102e36b87

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