Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b8440307ff23d8…

MALICIOUS

PDF

91.5 KB Created: 2021-04-21 22:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c345d36c71bb3c2101311cbb29360e75 SHA-1: eb06abc39098537b9526f7b7e59ab16a602b5f9d SHA-256: 73b8440307ff23d84481b96792f2db1af15531d3e217161f13238e386919404f
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, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable hosting, and the document body, though heavily obfuscated, suggests a lure related to search results or document titles. The presence of embedded URLs indicates an attempt to redirect the user to malicious sites for further exploitation.

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 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://pelibifir.ru/strik?utm_term=romeo+and+juliet+act+3+scene+2+questions+quizlet
    • http://chebsvet.ru/foxconn_winfast_n15235_motherboard_manualnx5hc.pdf
    • https://cdn.sqhk.co/sewadokoka/Zhcdmgj/19607283143.pdf
    • https://static.s123-cdn-static.com/uploads/4484093/normal_5ff29e3f01ba0.pdf
    • https://cdn-cms.f-static.net/uploads/4469841/normal_601727935fa87.pdf
    • https://cdn-cms.f-static.net/uploads/4450240/normal_601735c7463dd.pdf
    • http://jabofedu.sportsontheweb.net/4303922175.pdf
    • http://tiktokhd.design/fast_start_2.0_rodan_and_fields_2019x7xyl.pdf
    • http://myshoes.moscow/fender_mustang_i_v.2_20w_1x8_guitar_combo_amplifier79rvu.pdf
    • http://webcam-model.online/carry_on_lyrics_norah_jones_meaning7fs1q.pdf
    • https://static.s123-cdn-static.com/uploads/4379229/normal_5fc67de21761a.pdf
    • http://nanolenka.xyz/vagusugejujuxavw7d75.pdf
    • http://megopoveguvujal.medianewsonline.com/95243145664.pdf
    • https://cdn.sqhk.co/vusabutam/ihgjLjg/bikaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wixanarer/mivimanowesazuweluv.pdf
    • https://s3.amazonaws.com/votubukaxogilix/pretty_little_liars_book_11.pdf
    • https://s3.amazonaws.com/xapijifas/5869509271.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001072a.bin
f4af276adfbd294f20b95c3b5499ba379a6ca8887a27560e715313e4facf4d74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 8688 bytes
font_01_sfnt_off000123ea.bin
804b076e7c88a73739f3c6a69de6ebbd60bbd2b9da9cc63f6cac4f2290cee136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123EA 5544 bytes
font_02_sfnt_off000136c5.bin
63e0af302324e73292f279d6cc7cc409e945fe9efd4d0dbe9c8d8f328f82a4cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136C5 11712 bytes

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