Malicious PDF — malware analysis report

Static analysis result for SHA-256 60ea6581dfd20a75…

MALICIOUS

PDF

65.3 KB Created: 2021-02-04 09:53:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: acec7aea11b91f3413f59b56b4779d04 SHA-1: 18d400308e31550365d57cd59600f14fc326e1a3 SHA-256: 60ea6581dfd20a750056de6e0019588386784dce15a01b115a614bd4fe036076
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of creating a link farm to obscure the ultimate malicious destination.

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://maypoin.ru/aws?utm_term=caption+html+form PDF link annotation
    • http://tiktokfrance.fun/homero_pinto_caputollvz6.pdfIn PDF document text
    • https://dalegoronatodul.weebly.com/uploads/1/3/4/3/134309481/ec9c0a0d5dd1cd5.pdfIn PDF document text
    • http://immorta-cross1.club/kinetic_family_drawingw6xwy.pdfIn PDF document text
    • https://cdn.sqhk.co/tumupowe/fWLiiaL/asteroid_hitting_earth_2019_news.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/9v40iiW/27088833147.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/ePgfiUD/kifitejovejiwedot.pdfIn PDF document text
    • http://itactical.xyz/optative_sentence_into_indirect_speechqw056.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/sisaxu/wedadoz.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/origin_battlefield_4_dlc.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/61691155413.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/56472686716.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/kolixaxitetazedufudupi.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/medicine_reminder_app_android_code.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_off0000c0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F6 4868 bytes
SHA-256: c2c85b95c37f0ae0ef032ede26155919a46d2c77fac554451b9a29eaeb94d682
font_01_sfnt_off0000d159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD159 11224 bytes
SHA-256: ed943e7c8f2652011f3d4ff8bc20ca2b069b70c3a0c4b0091ea7df7860fd48e5

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