Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dba0400dde5dd66…

MALICIOUS

PDF

73.6 KB Created: 2021-06-06 14:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 878f43c824dee4b006865f2b714f2b30 SHA-1: c397550a7a42bad20dc3c4eca76d91eec8d5b699 SHA-256: 2dba0400dde5dd66ba14e9b69d36d2198154c739de5c6caf04a053562f923551
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on link farm domains, suggesting a phishing or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to redirect users to malicious sites, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/pbw?utm_term=minecraft+pe+gun+mod+android+download
    • https://jafumusatezod.weebly.com/uploads/1/3/4/4/134485233/dfbe4.pdf
    • https://kisimerib.weebly.com/uploads/1/3/4/6/134697331/4420312.pdf
    • https://bemakidej.weebly.com/uploads/1/3/0/7/130739127/varapari-suwinuwavop.pdf
    • https://xozagalan.weebly.com/uploads/1/3/4/5/134519104/613723c59fe.pdf
    • https://zipebamaxotunev.weebly.com/uploads/1/3/2/8/132814247/9026127.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8fe93c59-3271-4314-a6de-73d25d14e1df/genie_promax_pmx500ic_b_sensors.pdf
    • https://uploads.strikinglycdn.com/files/cff1a39f-8eac-4703-81a3-5a7100e15699/smc_ez_connect_g_driver.pdf
    • http://funuvutidip.pbworks.com/f/67733506348.pdf
    • https://uploads.strikinglycdn.com/files/64720846-f292-4d9c-aa19-580c7100e64c/25186519472.pdf
    • https://uploads.strikinglycdn.com/files/336e2b72-a62d-404a-90c8-e65a37d467f9/65577566779.pdf
    • https://uploads.strikinglycdn.com/files/331b980e-9f12-4981-b131-1900bd31811e/how_to_adjust_top_fin_filter.pdf
    • https://uploads.strikinglycdn.com/files/b264dae7-dfe4-44ab-8c24-34f1e4f76137/zuvigepitikabenupugojupu.pdf
    • http://jotoxipigi.pbworks.com/f/ford_escort_felgen.pdf
    • http://letonepamusi.pbworks.com/f/how_to_hack_into_a_cannon_safe.pdf
    • https://uploads.strikinglycdn.com/files/ce6ea753-94d1-4f6d-b526-50c10e715a9f/tamilrockers_telugu_movies_2020_free_download_hd.pdf
    • https://uploads.strikinglycdn.com/files/8324e226-f1ec-4823-9431-c396aac8468c/mibez.pdf
    • https://uploads.strikinglycdn.com/files/6b74cc5c-f8db-493d-be60-2e37e8657b02/karopuruvijomovebuj.pdf
    • https://uploads.strikinglycdn.com/files/7c83c4a2-bceb-4e86-b2d1-956662df38df/calories_in_long_john_silvers_fish.pdf
    • http://bovozajezo.pbworks.com/w/file/fetch/144713823/pojorijuzenefabefukufa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e169.bin
1a28de1dfb793d298318dbbbef61b929a590af664294c8daed06778c1fd9fe60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE169 5396 bytes
font_01_sfnt_off0000f3cf.bin
aa5d83d5192119fc479df3f2f75b1962271c233e4f878274658db8d86d9e4214		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CF 10928 bytes

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