Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3b657a098e9225…

MALICIOUS

PDF

101.9 KB Created: 2021-02-15 16:33:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 110de4dd7c04c1187909626b5be9eba3 SHA-1: bf1d880454a06472d3a8918a0cb44f62979a6ad1 SHA-256: 3c3b657a098e92251fbdbcaabc4f5a0e26fc7abc48e8b8a15730acbbd1465a2b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The document body, though partially obfuscated, mentions 'Importance of report writing in research methodology' and includes wkhtmltopdf metadata, indicating it was likely generated to appear as a legitimate document. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV's detection as Pdf.Phishing.Trojan, strongly suggests a malicious intent to redirect users to potentially harmful websites.

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://crophysi.ru/strik?utm_term=importance+of+report+writing+in+research+methodology PDF link annotation
    • https://cdn.sqhk.co/kolokejo/jfKDhhW/66633407707.pdfIn PDF document text
    • https://rasozonikazip.weebly.com/uploads/1/3/4/9/134904665/af20661.pdfIn PDF document text
    • http://moxokivotalunuz.iblogger.org/26482409710.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/dihKzih/desktop_tower_defense_1._5_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/xidosisew/iuzhiiQ/37916042982.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/WhiJBoW/paginevixutodosapivagukog.pdfIn PDF document text
    • https://kakejomoweva.weebly.com/uploads/1/3/4/6/134674311/nenojibeba.pdfIn PDF document text
    • http://zuviwadakaji.22web.org/migraine_news_reporter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jamurujitexezi.epizy.com/zifadep.pdfIn PDF document text
    • http://zorogimejovag.rf.gd/isomerism_questions_for_neet.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/information_technology_specialist_resume_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/substance_abuse_facts.pdfIn PDF document text
    • http://zuzeburim.epizy.com/bseb_patna_matric_result_2013_marksheet.pdfIn PDF document text
    • http://vizepojuduw.rf.gd/wow_classic_brutal_armor_quest_guide.pdfIn PDF document text
    • http://soburuwukipo.epizy.com/year_1_maths_worksheets.pdfIn PDF document text
    • http://sonowodiguvab.epizy.com/automation_testing_estimation_template.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/adobe_acrobat_standard_2017_version.pdfIn PDF document text
    • http://fologipuvug.epizy.com/31329793737.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000144d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D6 5488 bytes
SHA-256: ead25d23042eff8f72eb5d9651235bc2facbd775d06423e5daf291e5a60225c3
font_01_sfnt_off0001575a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1575A 10684 bytes
SHA-256: 0be6e33213af4b5c22ec7dadec1c62145b57cf1f354c85ed27779e4514c77cee
font_02_sfnt_off00017bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BB0 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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