Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d5c2067fbcfb36…

MALICIOUS

PDF

75.5 KB Created: 2021-03-16 07:07:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a903dff990b7d9128442c177ac1b2c7 SHA-1: 1696c6ecc13302739f5358a34a3e6e6a7ee649c6 SHA-256: f2d5c2067fbcfb36004d37043996c2bf1a2146ac62c608452cea97fabd8be323
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, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/award?keyword=black+and+white+photography+techniques+pdf
    • http://futup.ru/483342128182ubx.pdf
    • http://povulofi.mywebcommunity.org/32054362112.pdf
    • http://good-production20.site/wamotulabak7gsxl.pdf
    • http://nunesop.scienceontheweb.net/hunger_games_vol_1_ita.pdf
    • https://besikutusesa.weebly.com/uploads/1/3/2/6/132681218/9266392.pdf
    • https://topirameji.weebly.com/uploads/1/3/2/6/132682330/1b86fd.pdf
    • http://djami.ru/breathing_underwaterrkgih.pdf
    • http://lorem.space/what_is_the_traditional_music_of_japanmlsdy.pdf
    • http://dadevizevarek.scienceontheweb.net/funiraw.pdf
    • http://gejejasofubi.mywebcommunity.org/35850635645.pdf
    • http://wersita.fun/71180894682egckk.pdf
    • http://raffle.website/905803590894swgg.pdf
    • https://moxalabukeziro.weebly.com/uploads/1/3/4/7/134772199/82b443798745e23.pdf
    • http://good-production17.site/25973126604cjs2d.pdf
    • http://cancandance.org/foxapavnvr12.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_802e2a9c2ce5469b9b4e3f8524b93761.pdf?index=true
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_d0237ce294ba413c9949e07c901be643.pdf?index=true
    • http://nakeviw.myartsonline.com/marine_boilers_and_steam_engineering.pdf
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_b6cef1f5cc0c405e888ce42b09495915.pdf?index=true
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_4738fbdbaf6e4055b8fb6e13274e8c98.pdf?index=true
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_5ef5cc45746d427a9eb6e02b8469f8e6.pdf?index=true
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_304e715835b24ec18e2f9c2e70e87431.pdf?index=true
    • https://c69a8150-bb1e-4c46-878b-fc1622391bd7.filesusr.com/ugd/cf91d6_50693f7e1b404a9cbf851d31921c5ce9.pdf?index=true
    • 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_off0000e898.bin
57129cef950bbfb39ad6df42cef66796076d74da1b49b447f5602f17a9a8d6eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE898 5852 bytes
font_01_sfnt_off0000fc97.bin
b0fd653e923d5f0b261953e0841c92a69dcf04b41c85a078f3ea3cc066cdd095		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 10552 bytes

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