Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb8e1e94afe2d64…

MALICIOUS

PDF

78.7 KB Created: 2021-03-17 01:34:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbd6ffd4c400995ba58823dc01f95430 SHA-1: 7992f68f12a595df22bfa0527ef9ce268e356bc5 SHA-256: 2fb8e1e94afe2d64b73f41c216f12f1ee8814a1b6c35a15bb9d5d26a7738db76
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support the conclusion that this document is designed to redirect users to potentially harmful websites.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/123?utm_term=cadre+photo+paysage+grand+format
    • https://rasiguxi.weebly.com/uploads/1/3/5/3/135314707/696569.pdf
    • https://saditifoba.weebly.com/uploads/1/3/5/3/135325123/5816644.pdf
    • https://mujurusema.weebly.com/uploads/1/3/4/8/134846640/wudilonowobawawib.pdf
    • https://cdn-cms.f-static.net/uploads/4478703/normal_60388be907bce.pdf
    • http://xepidenad.scienceontheweb.net/vefepezekafo.pdf
    • http://lazujifoxupa.getenjoyment.net/what_is_the_best_cordless_phones.pdf
    • http://doxalasi.mywebcommunity.org/zefor.pdf
    • https://wesotapaxo.weebly.com/uploads/1/3/4/4/134488604/soxuraxis.pdf
    • https://fegilekupajot.weebly.com/uploads/1/3/4/4/134404616/jogewibuzutomavog.pdf
    • https://static.s123-cdn-static.com/uploads/4481161/normal_5fe375c98ad60.pdf
    • http://tazizinujumijoj.mywebcommunity.org/96194017002.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b2ab5541-4218-436d-8126-38388e260caa/have_returned_or_had_returned.pdf
    • http://jejaratusetiden.epizy.com/batafab.pdf
    • https://uploads.strikinglycdn.com/files/3dd0106b-43ac-4a4d-9f86-cb872cd50050/4417664630.pdf
    • https://uploads.strikinglycdn.com/files/5f18bff8-41a1-4cf0-934d-1fee6e66beae/linear_algebra_stephen_h._friedberg_free_download.pdf
    • http://nokejufesuw.atwebpages.com/sample_of_formal_application_letter.pdf
    • http://ziwivazud.onlinewebshop.net/71863452539.pdf
    • http://sajatuvireguta.atwebpages.com/the_meaning_of_things_a._c_grayling_download.pdf
    • http://fiviwuzovalexop.rf.gd/android_apps_maker_apk.pdf
    • http://lojogonofar.rf.gd/fofidogekapezutewoges.pdf
    • http://vorisenunajix.myartsonline.com/roland_barthes_camera_lucida_reflections_on_photography.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_off0000f2b3.bin
331b1ae9d6f7c8153708ad71bdb6c9dc095b28e5e0da83c8a051c7311f628f25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 5428 bytes
font_01_sfnt_off0001050c.bin
411f77c762c23e85b936aa67752f1aa478928bf966f2162de151f42eed11135c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 12088 bytes

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