Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f054cf816518b51…

MALICIOUS

PDF

76.7 KB Created: 2021-03-02 02:14:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 80cb1761b6e23727a8128710ad4bd5b3 SHA-1: 9eb3b9405e520b41a2f5f75b3c1a76cbb38ac008 SHA-256: 3f054cf816518b5198e289858253f8efa5d6a8ddf29f2a3390c9167af264d991
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=producers+in+the+open+ocean+biome In PDF document text
    • http://xitnet.fun/what_is_the_salary_of_a_ccna_certified_personvht3l.pdfIn PDF document text
    • http://wikowezenitezo.medianewsonline.com/baldurs_gate_2_enhanced_edition_pc_review.pdfIn PDF document text
    • http://gawewatejunowib.iblogger.org/machine_learning_beginner_guide.pdfIn PDF document text
    • http://detonic-italia.website/rs3_woodcutting_guide_2019o12m1.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/wonejopajinanuforelevi.pdfIn PDF document text
    • http://kwini-fini.online/bee_gees_greatest_hits_videos3m715.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/xofepitawibusi-zotekosux.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/vajixitekufazarelxkfjv.pdfIn PDF document text
    • https://bajupeboxima.weebly.com/uploads/1/3/5/3/135327322/fodoveb.pdfIn PDF document text
    • http://nout-prodat.site/what_are_the_top_boy_names_for_2020_uk36ckx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zovogimobidel.rf.gd/88851799530.pdfIn PDF document text
    • http://nelifofufotilep.epizy.com/financial_institutions_powerpoint_template.pdfIn PDF document text
    • http://woxedizoxe.rf.gd/tibial_plateau_fracture_rehabilitation_guidelines.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_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 5420 bytes
SHA-256: 3519d0093de3cb8c8447cd9f6dbe41517248f5242dffc9229d049905addff2a6
font_01_sfnt_off00010203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 10592 bytes
SHA-256: a25ae2376340feecb6224e33a969764ffcb5127481555b91c7195192b3bcd114

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