Malicious PDF — malware analysis report

Static analysis result for SHA-256 30c1770a7228ff77…

MALICIOUS

PDF

64.0 KB Created: 2021-02-11 20:04:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 74c806f3dcc40c8d71be271adc68f3e7 SHA-1: eeb27a7804b228d77946b0db513cda5017a1efdd SHA-256: 30c1770a7228ff77717a14812bb3996dcad08e45885d1d94566c5547827506ea
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/123?utm_term=in+watermelon+sugar+pdf+espa%25C3%25B1ol PDF link annotation
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/rajotebopav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366362/normal_5fc931bced406.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465263/normal_601f07d9e2934.pdfIn PDF document text
    • http://copyrighytsupport.com/xapezugonituzuwixuxumrmdtu.pdfIn PDF document text
    • http://top-salez.site/time_worksheets_grade_3_word_problemsyxmk8.pdfIn PDF document text
    • http://kernig.online/yummy_tummy_guide_amanda_finnie85pis.pdfIn PDF document text
    • https://poxomovuru.weebly.com/uploads/1/3/1/3/131381772/juwilawarureme-belasasofan-fegojafasibu.pdfIn PDF document text
    • http://fomilexavekol.22web.org/canada_pension_early_retirement_forms.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417123/normal_5fcf3b9a727b9.pdfIn PDF document text
    • http://pet-guru.shop/jenavefepiburonuti5pkj5.pdfIn PDF document text
    • https://kiwiwutirove.weebly.com/uploads/1/3/4/7/134707888/jenapo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bideliv.rf.gd/51840130511.pdfIn PDF document text
    • http://kulixuvomewono.epizy.com/dexter_cast_season_4_reporter.pdfIn PDF document text
    • http://faluzaxubip.epizy.com/continuity_of_a_function_examples_with_answers.pdfIn PDF document text
    • http://fupizud.rf.gd/97845720151.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_off0000bcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBD 5600 bytes
SHA-256: 959696c9c06952ce941af26b20ea7108ce2e86911ae57f099227a64582dc6196
font_01_sfnt_off0000cf87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF87 9880 bytes
SHA-256: 9b29a543bb1a1fd2d17c4d2b421d815a652053febfd6c015d5ec1a41d41e3e51

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