Malicious PDF — malware analysis report

Static analysis result for SHA-256 011af77264353620…

MALICIOUS

PDF

113.7 KB Created: 2021-02-25 02:45:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a613da6a8ecc8a0286de8959f343241d SHA-1: 8067457ca516503d27774d1c73c41fca821a8e61 SHA-256: 011af77264353620de4658f6a1efebd50e36c7e66a06a15d294090aafdc3f8f3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and a link farm heuristic points to the document's primary function being to redirect users to potentially harmful external sites.

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://maypoin.ru/aws?utm_term=grohe+kitchen+faucet+maintenance PDF link annotation
    • https://tusatetop.weebly.com/uploads/1/3/1/4/131408029/wokepesozizipu.pdfIn PDF document text
    • http://ek-arenda.ru/xobekukekesiqgh.pdfIn PDF document text
    • https://cdn.sqhk.co/gunuzuli/Mhejgia/poe_elementalist_build_arc.pdfIn PDF document text
    • http://premiumpornclips.com/79296039626pdkik.pdfIn PDF document text
    • http://springwin.space/233627034850zsmu.pdfIn PDF document text
    • https://mosagalalevo.weebly.com/uploads/1/3/4/6/134668437/6374611.pdfIn PDF document text
    • http://reloturuvum.22web.org/tipos_de_graficos_en_excel_cotizaciones.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484624/normal_5fd7ac1bf3c28.pdfIn PDF document text
    • http://povar2020.site/14748884127ox6vk.pdfIn PDF document text
    • http://drovazvenigorod.ru/apus_library_style_guide_for_majorsdj569.pdfIn PDF document text
    • http://lotto-investclub.com/61575330021gaohv.pdfIn PDF document text
    • http://monoga.space/how_to_figure_out_what_scale_a_song_is_injy3jf.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/gjBibvw/tujuwotutat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386609/normal_602968f0c3abd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nezebur.epizy.com/tadavesumanaxuderetabig.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_off00018113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18113 5004 bytes
SHA-256: 26cd2dd5f643cd2c2f5be84cb4f0985b3920db78cf432914c26e82bcf7c660aa
font_01_sfnt_off000191f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191F8 11912 bytes
SHA-256: 42b1f37b334bed4c69438c6a8529d9fc23e14555c69d32fa24bb21ae32c27b17

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