Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0850804e4713e53…

MALICIOUS

PDF

78.1 KB Created: 2021-02-28 08:30:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 64fbe4a0af0afa9644e91aa001f3cb6a SHA-1: e6cc30af8e256f9aa7183382e89821c628d69bc6 SHA-256: f0850804e4713e532e703600addd732d82b839c82483cfd07b61cafe19bc6e1e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('kuzutuzo.ru') and another to a link farm ('botumizesakukij.iblogger.org'). The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further suggesting malicious intent.

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://kuzutuzo.ru/strik?utm_term=is+the+wsj+wine+club+a+good+deal PDF link annotation
    • http://botumizesakukij.iblogger.org/jozirosig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451228/normal_60192ed6156ac.pdfIn PDF document text
    • http://copyrights-notices-helps.com/97481324939lpq1c.pdfIn PDF document text
    • http://jijagigipijum.iblogger.org/what_happens_when_you_get_doubles_in_monopoly.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456387/normal_60033fc3a09ee.pdfIn PDF document text
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/viwofuzeb.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/the_lord_of_the_rings_the_hobbit_book_review.pdfIn PDF document text
    • http://lewulumotuf.iblogger.org/16588809221.pdfIn PDF document text
    • http://natural-shop.info/how_to_use_excel_2013_formulas_cheat_sheetm5zzw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_60281a7d6d39a.pdfIn PDF document text
    • https://pumagawiluzade.weebly.com/uploads/1/3/4/6/134697536/fba749199d23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_6014b21c2076a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitasixan.atwebpages.com/sedifujovotexu.pdfIn PDF document text
    • http://pamiduzaluwo.epizy.com/how_much_does_a_cfa_make_per_year.pdfIn PDF document text
    • http://gudanomakorake.epizy.com/avg_tuneup_2018_free.pdfIn PDF document text
    • http://notavopanugatog.epizy.com/tumadenegox.pdfIn PDF document text
    • http://vomotoboxavixot.epizy.com/arduino_uno_software_serial_not_working.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_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 5352 bytes
SHA-256: d05c1e02d8b78bdcab1d1c51697dc65d7982ae3aa10ac4535e325b999afcbb17
font_01_sfnt_off00010342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 11284 bytes
SHA-256: b35e152af400c20f34d76f6c47b13f4c5ae24ed60c51f6727c362596f72d8ad1

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