Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb263c19f46723eb…

MALICIOUS

PDF

84.4 KB Created: 2021-03-04 06:10:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 2ce40b9cec9ee4b55bfae60f9aa7056e SHA-1: 5562dc0c80210f4d1b06d869be202b6815287799 SHA-256: fb263c19f46723eb11d127493d2387b4d31985b064802c46403974daa2a97c57
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting an attempt to redirect users to potentially malicious websites. The primary URL observed is 'https://xajibur.ru/strik?utm_term=how+to+use+ln+on+ba+ii+plus', which is likely part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://xajibur.ru/strik?utm_term=how+to+use+ln+on+ba+ii+plus PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368741/normal_6032c390c9ce7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502817/normal_5ff0179b4e28d.pdfIn PDF document text
    • http://nekretnine.site/adobe_acrobat_distiller_5.0_free_dowgolqt.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxazagugura/jhijhuG/pacific_time_to_gmt_6.pdfIn PDF document text
    • https://cdn.sqhk.co/kamepixuxuk/jLsFRid/briefings_in_bioinformatics_review_time.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_5fe6cff1e8228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447108/normal_601f8291cc918.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444657/normal_5ffbd53dd6e0a.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/Lhaqhde/mymtn_app_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/fogunedevare/ahejdhc/wuwatakapaputidixeji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493873/normal_6029793a950ac.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/hhRhfdp/best_action_thriller_hollywood_movies_2015.pdfIn PDF document text
    • https://zutujoxiker.weebly.com/uploads/1/3/0/7/130776667/bajarezoziwogad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474739/normal_60112818b52cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_5fd19a182f38d.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/F7jhOge/28569260477.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001017a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017A 4912 bytes
SHA-256: 060f226dd36b3cc9967e2b84ff3120bee650a99cd305661d0960c1d34f7c5ea8
font_01_sfnt_off00011249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11249 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00011ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD6 12120 bytes
SHA-256: 432035c7f3cad91c2889395da8f7b101bdb392f0025460b9a9a10684d22a9f0c

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