Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f43377ba961f245…

MALICIOUS

PDF

118.6 KB Created: 2021-02-17 16:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6ebbc1096795fada1ef8eae2d9af4f5c SHA-1: 6ce434b7c3069224846eaec91a685f0f5de0d4b1 SHA-256: 6f43377ba961f24599b56da7d4db2cb88f527d0b0b4682de99247a4564436519
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable or free hosting services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://seumenha.ru/wix?keyword=nokia+tracfone+2004 PDF link annotation
    • https://dojosofezi.weebly.com/uploads/1/3/5/3/135390984/losawaremonejixubuzu.pdfIn PDF document text
    • http://ruwegekugite.22web.org/sda_sabbath_school_lesson_teacher_s_guide.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/palupuba.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/ifii3ey/browse_button_css_in_bootstrap.pdfIn PDF document text
    • http://de-bewertung-889562.icu/pentagon_naughty_boy_lyrics_terjemahankn3e3.pdfIn PDF document text
    • http://acgmgroup.ru/37679168499ytmrk.pdfIn PDF document text
    • http://ionatr.space/ejercicios_matematicos_para_nios_de_preescolaruqgy4.pdfIn PDF document text
    • https://moxiwomalupul.weebly.com/uploads/1/3/4/5/134598527/716392.pdfIn PDF document text
    • https://setupazaz.weebly.com/uploads/1/3/4/7/134772318/a74a0b44f29576.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pidulejos.epizy.com/64023055724.pdfIn PDF document text
    • http://xitutudatiri.epizy.com/receipt_template_photoshop.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001802d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1802D 5060 bytes
SHA-256: 3df3f9d1222b9e2871464655eb61f4bc7f7e89d85ffb4825c06056e3f9ddddad
font_01_sfnt_off00019184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19184 11312 bytes
SHA-256: 41413b0c04516c9bb3000a799c1c956235f221b1d81da203896f751082e2ddd0
font_02_sfnt_off0001b844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B844 16076 bytes
SHA-256: f530883c3cc306000364b4084cae578ea9cd0c162069bd297b59107afb5012c9

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