Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43d06e074993603…

MALICIOUS

PDF

76.8 KB Created: 2021-03-17 10:29:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a9c4ae7487ec0d33578f4fed82e6a27 SHA-1: 7c2e35049905a829fe303eff4959a4644cb578d7 SHA-256: f43d06e07499360320856c82212e3d30cd33f000e1d516b0085236a934d5db8e
156 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 for 'Pdf.Phishing.Trojan'. The presence of a large number of external links, many with numeric slugs, suggests a link farm designed to direct users to potentially malicious content. The primary URL, 'https://resalured.ru/award?keyword=cbse+admit+card+2020+class+10+download+pdf', indicates a lure related to academic documents, likely for phishing or malware distribution.

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://resalured.ru/award?keyword=cbse+admit+card+2020+class+10+download+pdf
    • https://cdn.sqhk.co/zupitefa/iZjfhaL/16469469708.pdf
    • http://hermidkovo.info/vunawububuwiwokipufukhq2u.pdf
    • http://evgeniy-semenenko.ru/33985162094du0o3.pdf
    • http://normaa-id.com/photoshop_tutorial_step_by_step_in_hindikavq4.pdf
    • https://cdn.sqhk.co/tinupolureg/gjQyj4o/poruxodalapivilu.pdf
    • http://freshmind.net/web_shell_html_css_js_idelib2q.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_507308cd302a47b9b4dc85dfe0b71c18.pdf?index=true
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_e9e1eb509b42493d807c55aa7fa9ae70.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e7234031-b7ba-4fa3-8bdf-71d8a692248e/71692430628.pdf
    • http://wupigokoravu.epizy.com/didilogakifep.pdf
    • http://memaded.epizy.com/barbie_doll_cartoon_video_song.pdf
    • https://uploads.strikinglycdn.com/files/26185249-682f-4092-bc26-898f9b2ff141/walukanogegif.pdf
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_6e86f5e907e5493d817b76b9bb76130b.pdf?index=true
    • http://xanokilil.rf.gd/deuterocanonical_books.pdf
    • https://uploads.strikinglycdn.com/files/0e2d05d9-73c9-4ca8-8a34-2aaebac1c9e0/how_much_oil_in_jeep_wrangler_3.8.pdf
    • https://uploads.strikinglycdn.com/files/77ddd782-1194-4e85-8f6a-bd77af8cb65b/tamil_font_design_online_free.pdf
    • https://uploads.strikinglycdn.com/files/19a10191-084a-4a52-ac49-024afd11d4b4/trigonometry_formula_calculator.pdf
    • http://jiwepatifon.rf.gd/hindemith_der_schwanendreher_sheet_music.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_off0000eca0.bin
f268a5d9a080f9c5c242022edffc9312c28ee21607d09abb1bed3cd1d163058d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECA0 5764 bytes
font_01_sfnt_off00010035.bin
d64ccc84b227c7b74d7c05a1a16e454fefe57cf8d1586fff5cc8fdfcaf2d4a36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 10980 bytes

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