Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f37316b1d5c313…

MALICIOUS

PDF

67.5 KB Created: 2021-02-06 21:48:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b2a8de400dafffc4205fb5988e3d70ce SHA-1: eb5e367c3004c8d73346dff8346236a04e1524a9 SHA-256: 51f37316b1d5c31377e4cfe65818a763b6bc357785171f302a950c5f163432d0
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were extracted, the presence of a malicious URL and the document's structure suggest it's designed to trick users into clicking through to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/wb?keyword=chauffeur In PDF document text
    • https://cdn-cms.f-static.net/uploads/4459060/normal_600f3c9db3690.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485702/normal_5ff25d2a88118.pdfIn PDF document text
    • http://sanadewa.iblogger.org/good_luck_chuck_movie_subtitles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473632/normal_5fda5152cf8eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421940/normal_5fdd1427e8c20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475577/normal_5ff3c3258e489.pdfIn PDF document text
    • https://zukudanasoxe.weebly.com/uploads/1/3/2/8/132815154/jerubogakokedazis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://merojupamen.epizy.com/lojadal.pdfIn PDF document text
    • http://kutoduno.rf.gd/2014_apes_frq_answers_question_3.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/bekhayali_song_kabir_singh_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/wasufesivizusa.pdfIn PDF document text
    • http://zobatokuvanoz.epizy.com/mulujex.pdfIn PDF document text
    • http://nupejodolet.epizy.com/baarishein_anuv_jain_full_song.pdfIn PDF document text
    • http://vobisobopimab.epizy.com/free_invitations_templates_birthday.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD14 5476 bytes
SHA-256: 57e1bb4795a257ade1c16794366ce5d4fac45163adbb59db07435f61b29857f8
font_01_sfnt_off0000df97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 9812 bytes
SHA-256: 8b44a5e681f3b2051de56d595ee5a8f99b7dfc9683863476d0fbb0446adb759e

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