Malicious PDF — malware analysis report

Static analysis result for SHA-256 719a47706ade619d…

MALICIOUS

PDF

72.4 KB Created: 2021-02-22 11:03:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 67eeed08742e014662b3c5f91f16af5a SHA-1: 0a03793b30400c1b801596da73761eeea35128dd SHA-256: 719a47706ade619d703c0a27a783af0d2dd7f5db8ac20a733ed37249ef437dcf
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, with at least one pointing to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be junk data, but the presence of numerous external links suggests the primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=amc+10+2021+online In PDF document text
    • https://cdn-cms.f-static.net/uploads/4499629/normal_600c9af338b44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421207/normal_6033331f7a597.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420250/normal_5fcda922b7a99.pdfIn PDF document text
    • https://vominitaxa.weebly.com/uploads/1/3/4/6/134677623/resepizidevolereper.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/djdOghc/tubimupepoka.pdfIn PDF document text
    • https://cdn.sqhk.co/senaveduwiz/nC8heie/bujabizojijos.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/kubedukowug/pokemon_x_3ds_rom_for_citra_android.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/38774610506.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/at_t_support_plus_pc_maintenance_toolbox.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/audi_car_wallpaper_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/how_to_prove_trigonometric_identities.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/via_browser_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/wagez.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/kindergarten_1_english_worksheets_singapore.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/compare_spreadsheets_in_excel_365.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_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 4776 bytes
SHA-256: 6b7a6e82f1c454d9665b069d4ff829cf548a16a8f1960b4de92d5481a849edf5
font_01_sfnt_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 11016 bytes
SHA-256: 1cbdc7f8a8c2721cbec1d6baff1a842472bb177a5db3736b5244c7c8e7fe2293

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