Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ff51ef2f504f62…

MALICIOUS

PDF

81.7 KB Created: 2021-03-09 08:50:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8c4fd8c7213b7126510d081d657620c4 SHA-1: b01d6f22a507da9fa9d65a6d42189b561d7da2ed SHA-256: e1ff51ef2f504f62ff828f7b15a838ca203b65687200935fa887466121b8f102
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK, indicating it's part of a link farm designed for phishing. The embedded URLs, such as https://dugedepap.ru/award?keyword=dbx+venue+360+pdf, are likely used to redirect users to malicious sites. The ML classifier and ClamAV detection further confirm its malicious nature, suggesting it's a phishing lure.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dugedepap.ru/award?keyword=dbx+venue+360+pdf PDF link annotation
    • http://lazujifoxupa.getenjoyment.net/74139503373.pdfIn PDF document text
    • https://regogugone.weebly.com/uploads/1/3/4/8/134891767/ed5e11db16d94.pdfIn PDF document text
    • https://lakizixobatit.weebly.com/uploads/1/3/4/3/134325667/zuzatajanopera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445119/normal_5fe9f600191c2.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/wivitofegajuxej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481402/normal_602e6d46deb1b.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/YjjhaJP/amazon_alexa_deals_best_buy.pdfIn PDF document text
    • http://sigixexizo.sportsontheweb.net/43468469001.pdfIn PDF document text
    • https://boxizegovabore.weebly.com/uploads/1/3/1/3/131379280/f9664.pdfIn PDF document text
    • https://cdn.sqhk.co/wibezudak/GDRpGjb/skyward_login_edinburg_cisd.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/hcgeAAe/seven_deadly_sins_grand_cross_chest_code_global.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/wiwamoxamo/inkbird_itc-1000f_manual_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/frame_template_psd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/vokikeneneposibepipe.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/firoro.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/lavijidojefirizen.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/instalacion_de_gas_natural_para_autos.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_off0000f070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 4888 bytes
SHA-256: ebf15bb17fdf14739dcb72ae25d7cb97881bd67a1ef57446a73887cc11e061b4
font_01_sfnt_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 14932 bytes
SHA-256: 94705327519a08cb4b678bd49df0e8bbe043b6d59858bbb7742d120c4e54b74b
font_02_sfnt_off00012bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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