Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d89120b9fbf425…

MALICIOUS

PDF

84.1 KB Created: 2021-04-03 20:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cc7b8442b9d7e9f1eed73e318d9fd67b SHA-1: 2624e7ea508d0dd9c70b888efd0bd500203cad17 SHA-256: d6d89120b9fbf425fd8d044e0b0937731336b0cd14643b4b23727726762e64a4
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links to potentially malicious or phishing sites, with one prominent URL being https://druttle.ru/wix?keyword=mason+storm+quotes. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create documents for web scraping or conversion, which can be abused for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://druttle.ru/wix?keyword=mason+storm+quotes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448357/normal_604ebc378c849.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxikinanibu/HpBMsid/pandemic_unemployment_assistance_ny_login.pdfIn PDF document text
    • https://cdn.sqhk.co/kamupudoro/jdjiTji/wawibumonapexemefo.pdfIn PDF document text
    • https://cdn.sqhk.co/bezakebijuk/gh9ihib/2313910500.pdfIn PDF document text
    • https://cdn.sqhk.co/merojuniv/iiIMhbp/calendario_lunar_2019_costa_rica.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456389/normal_5fd8f0cf60161.pdfIn PDF document text
    • https://cdn.sqhk.co/nipigagavadu/ji5am55/dobaturufazupubasa.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/cigicgj/83482416180.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikureta/ha4DNg8/roman_numerals_converter_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409000/normal_6060181b11d3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365612/normal_5ff44c51406eb.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/sibTFie/class_8th_science_ncert_solutions_chapter_18.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
    • https://s3.amazonaws.com/jenagubadopi/tovivik.pdfIn PDF document text
    • http://dupolizeza.epizy.com/honda_gc160_pressure_washer_engine.pdfIn PDF document text
    • http://jowanesivokadeb.rf.gd/longman_handy_learners_dictionary_of_american_english.pdfIn PDF document text
    • http://powiwuroda.epizy.com/64822690239.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/buenos_dias_princesa_en_frances_traduccion.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/tesizavivaxuzaf.pdfIn PDF document text
    • http://mejoxuxo.rf.gd/79662824782.pdfIn PDF document text
    • http://valutef.rf.gd/benim_hocam_video_ders_notlar_2020.pdfIn PDF document text
    • http://vefilemegukur.epizy.com/reduforolefo.pdfIn PDF document text
    • http://lewimidofi.epizy.com/32562991440.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/turoni.pdfIn PDF document text
    • http://savagit.rf.gd/20205590994.pdfIn PDF document text
    • http://lenegimuni.epizy.com/fanaseporatafewof.pdfIn PDF document text
    • http://tokafibalo.epizy.com/aptana_studio_3_for_windows.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_off0000ff70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF70 4764 bytes
SHA-256: d5f10fe820a5a32bafc8b7243260816c5f982081e2c3d02e07ccea38938e83b4
font_01_sfnt_off00010f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7F 10936 bytes
SHA-256: a26ae69bb8b026a8ce421644c2634f67eeb1d96ff2b4ed61f8f5582780b69f1d
font_02_sfnt_off000134c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361