Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb16ceb76225155…

MALICIOUS

PDF

65.7 KB Created: 2021-03-02 23:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e23be76fbf55838dcd9c40e6a5304e24 SHA-1: b0ca36dd49a2b8aa33f044f52a406ada7b717192 SHA-256: aeb16ceb76225155e1b70cf008a4dea8aba9267c6fc3cb65198ef15bd65975dc
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm and an SEO redirector pointing to the URL https://bologen.ru/strik?utm_term=how+to+turn+volume+down+on+angelcare+monitor, which is likely used for phishing or to serve further malicious content. The document body, though partially corrupted, suggests a lure related to a common search query.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://bologen.ru/strik?utm_term=how+to+turn+volume+down+on+angelcare+monitor PDF link annotation
    • http://zakewabo.scienceontheweb.net/casio_ctk_700_manual.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/d94e0e21f.pdfIn PDF document text
    • https://cdn.sqhk.co/ramazunor/geviahc/64973221843.pdfIn PDF document text
    • http://dabukim.mygamesonline.org/how_to_replace_a_belt_on_a_hoover_windtunnel_vacuum_cleaner.pdfIn PDF document text
    • http://vienvozvrat.site/75690260821bd5ne.pdfIn PDF document text
    • https://fevobubutexub.weebly.com/uploads/1/3/4/4/134481878/vebazewetobire.pdfIn PDF document text
    • https://kufesivewafe.weebly.com/uploads/1/3/1/3/131384244/0d44aa7316.pdfIn PDF document text
    • http://arboozfilm.com/gigabyte_x570_aorus_pro_wifi_manualev8ju.pdfIn PDF document text
    • http://xonitaj.mywebcommunity.org/fanararomotu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/85454681145.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/35409762443.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/brochure_booklet_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/86785485027.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/1018743161.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/66848317527.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/90883638237.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/how_to_connect_logitech_bluetooth_keyboard_ipad.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_off0000c55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55C 5192 bytes
SHA-256: 1b965b20440b1b33a81198816fab538da748ce6aa2fbf0952ccebec002f9e1c9
font_01_sfnt_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 10260 bytes
SHA-256: 4bb42cdd47a083ce50fe4a733280b68b9facb946cd3b5810d9242eb764114e9b

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