Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5d6a79fc381ec1…

MALICIOUS

PDF

80.3 KB Created: 2021-01-19 00:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 043d59e4539bce717def75a62e3f9e33 SHA-1: 4e8969a13d306f2dec654fe91a1b108e3ce23234 SHA-256: 1f5d6a79fc381ec197f063214084cbfb213f3b56bda9f041c8530eb8f7bd3434
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary purpose appears to be directing users to various external PDF files hosted on different domains, potentially for phishing or to serve as a distribution point for further malware. While no scripts were explicitly extracted, the nature of the link farm and the ML classification suggest malicious intent.

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
  • 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://bologen.ru/123?utm_term=q+in+cursive+uppercase PDF link annotation
    • https://waridiregap.weebly.com/uploads/1/3/4/0/134095836/vefifafuwu.pdfIn PDF document text
    • https://kakowafalajoji.weebly.com/uploads/1/3/4/4/134455686/zatumukanowuluvu.pdfIn PDF document text
    • https://cdn.sqhk.co/duxajoje/gjgijei/xabujutitejezarutekera.pdfIn PDF document text
    • https://gabubogoko.weebly.com/uploads/1/3/3/9/133997439/kosujebeta.pdfIn PDF document text
    • https://site-1181045.mozfiles.com/files/1181045/sivuloxopesujopoxuge.pdfIn PDF document text
    • https://site-1174993.mozfiles.com/files/1174993/multipart_form-_data_post_json.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/v5jjib1/best_drag_racers_of_all_time.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/gapeze.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/94399957556.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/sqlite_field_types_android.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/bts_world_heartbeat_song.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 4708 bytes
SHA-256: ad1c6fa4dfd2d02492b2b54644e0086e30e3abd94e8fb4c69849a27c83bc8eda
font_01_sfnt_off00010260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10260 10548 bytes
SHA-256: 44dee3870832f46e9e2ceabc09a555de3e38d82fa128e3492d7110edaa2a4072
font_02_sfnt_off00012643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12643 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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