Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ac98edefa76f7e…

MALICIOUS

PDF

76.1 KB Created: 2021-05-04 00:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3466fa644dfed609761d8d7d38847e24 SHA-1: 1c89146abe1142cdaa55fedb5cd0aa9df67345d3 SHA-256: 75ac98edefa76f7e68587d5cf9b40640280835c176396d0c3729222ec6d76219
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing or malware distribution campaign. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, with the primary malicious URL identified as https://dafemum.ru/strik. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, potentially to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=what+order+to+read+dc+rebirth PDF link annotation
    • http://hayatevesigar.online/totenasubtflqh.pdfIn PDF document text
    • http://qwertyujg.xyz/10250211039c9156.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/eiciihd/stock_zoom_video.pdfIn PDF document text
    • http://shimano-stradic.ru/735234370382hiht.pdfIn PDF document text
    • https://cdn.sqhk.co/zanuduwedimu/5kicgdX/73517429456.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/3gzicih/81947408687.pdfIn PDF document text
    • https://cdn.sqhk.co/zimogemage/Oicjhgf/xexip.pdfIn PDF document text
    • https://cdn.sqhk.co/noremixujor/jDhc3Bi/bununomevonufisarewu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0dc5fd1c-b354-4e5b-9ccd-45395e8994ed.filesusr.com/ugd/f79e8d_cdb5e2e4bc3c41a3b3414d3e5fe288f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zagubip/my_favorite_things_coltrane_live.pdfIn PDF document text
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_e4e4d5fbeb0c4e1f9765c60faeeb7699.pdf?index=trueIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_8b6197f9c862437095b2d7bef41f24f7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/what_does_aisi_stand_for.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/wiwakikaf.pdfIn PDF document text
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_ffb3098a9139476c923689a20dd6d5fb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/consulting_html_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/xokonerojuxite.pdfIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_b7a233ad01d74a4b9d788c2d9dd42457.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pegebunov/ruruxakopon.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_c2eba935b22d41a18d5b69a9f918f78e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divikufifir/best_lower_body_stretches_before_workout.pdfIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_a8ef719dd6e94afe89e11319e4ffdb8a.pdf?index=trueIn 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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 4972 bytes
SHA-256: 461655e37208652794056213acacfe66f5fa571d63310ccc23562da8af81fb8e
font_01_sfnt_off0000fd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD91 11140 bytes
SHA-256: a00f7cc0b837a591a033f1ab0a9b5d3f26f2f749201cf83a5bd4e0122fa91385

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