Malicious PDF — malware analysis report

Static analysis result for SHA-256 0610789dc92081f4…

MALICIOUS

PDF

69.4 KB Created: 2021-03-06 15:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ca071742bd064f2d657159e9bafc35c2 SHA-1: b03c8d4e43c7ca761710df8049d5bdc3807448c1 SHA-256: 0610789dc92081f4c74d93cc1ced208551c2995fc95909aa88f05aaf378cfff8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a link farm with numerous external PDF links, one of which is `https://seumenha.ru/strik?utm_term=healthrider+s300i+treadmill+troubleshooting`. The document body, though heavily obfuscated, appears to contain metadata related to the authoring application and creation date, suggesting it was programmatically generated. The presence of a link farm and external URIs strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=healthrider+s300i+treadmill+troubleshooting PDF link annotation
    • https://cdn.sqhk.co/febapaji/DidRxhf/wodudorazag.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/DV0gcjd/21392601669.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/hgjeqge/3021019043.pdfIn PDF document text
    • http://servempieza.site/bolens_1656_parts_listp85rz.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/hhghjcR/nedobabemewopagamup.pdfIn PDF document text
    • https://cdn.sqhk.co/pabilere/HgcjhPv/free_download_mp3_gfriend_apple.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f7af85c-fcde-48c2-8c04-265c5f245fb8/21069522038.pdfIn PDF document text
    • https://246406bc-bb0d-4f29-baed-d8a6153a9543.filesusr.com/ugd/3ddeef_d94da73b80544796ac7f8c04fbdf69b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/55848908063.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/guideone_insurance_news.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/xififodisetixufoxofenoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/96237496186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/764cdcb6-7a31-4528-a35b-f6454d1fa5e2/kivufawoxidupazawemawexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c414392-24e3-4090-90d6-0cba8a0aefb7/pepojelikesuworojozetake.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/dieta_perder_barriga_em_uma_semana.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/bdo_xbox_money_making_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6a1935a-bea4-4e12-b9ac-67d349a2aba5/sovetubifoboki.pdfIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_342c8f50755b4caf912f0876d513ef50.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gudukupir/clair_de_lune_guitar_duet_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/37820063475.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/25319994661.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_off0000cd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7E 5644 bytes
SHA-256: 775b1ffb3e4567fc78138476d29011ad3b7dae01c45ebdd2a54042bfc61253a9
font_01_sfnt_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 11032 bytes
SHA-256: 6475a7350ceaea7a4ddc63b738ea43d07935236f5ba3afe6c98661df2f0d7e61

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