Malicious PDF — malware analysis report

Static analysis result for SHA-256 11de7ec812de0f79…

MALICIOUS

PDF

75.4 KB Created: 2021-05-07 09:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5227052c25fe615361920e9eb912ebd SHA-1: 72df8dc02d13c06344299bdcebe9930b948b6784 SHA-256: 11de7ec812de0f79c70f527161bcb95eab9e7ba42157100c442a19bce31b5a0d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=how+to+transfer+contacts+from+phone+to+sim+card
    • http://mudikovarew.mygamesonline.org/91000894479.pdf
    • https://jazebaza.weebly.com/uploads/1/3/4/6/134662006/4ff250.pdf
    • http://zokupez.mygamesonline.org/85194766784.pdf
    • https://wodirukuz.weebly.com/uploads/1/3/5/3/135398055/vakogemiwusow_tipalofinemudo_wigajimazef.pdf
    • http://nilutafejo.mypressonline.com/31479896698.pdf
    • http://dhl-order.info/42029559826imlmt.pdf
    • http://fitness-ital.fun/megumitubumunefywus4.pdf
    • http://lozejebivo.scienceontheweb.net/bissell_crosswave_pet_pro_2328_parts.pdf
    • http://kakorixow.mygamesonline.org/asus_rampage_v_extreme_wifi_antenna.pdf
    • http://vutajazelige.medianewsonline.com/davigawolir.pdf
    • http://fanisore.sportsontheweb.net/72816533133.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2041a8d5-00c5-402c-9563-fe1e1cd4cea7/general_data_protection_regulation_passed_by_the_european_union.pdf
    • https://uploads.strikinglycdn.com/files/64cac5d2-1472-4c54-bde3-cb363e87d877/13006797919.pdf
    • https://uploads.strikinglycdn.com/files/337a89b8-4b04-4dfe-bed3-82039d2e73bc/mizega.pdf
    • https://uploads.strikinglycdn.com/files/eff7bbe5-c4a3-4e93-812c-48800cd86a70/boy_scout_rank_requirements_tenderfoot.pdf
    • https://uploads.strikinglycdn.com/files/7750302c-f789-4414-9490-6d78dc481d12/90749427468.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e95b.bin
1a3b3dccd6a06d704a890ef38785745c8dfd35df491b82f78740c8cbfc6b071a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 5416 bytes
font_01_sfnt_off0000fba8.bin
dcfbb398fa4411f901db4aa35b9abf80c77203bdf121f810002b7c00416736a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 10860 bytes