Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3023afd06ac12d…

MALICIOUS

PDF

185.9 KB Created: 2021-02-01 10:41:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 632c4c9db53d1f1c02076ede1f3d85ea SHA-1: 2a9e4d507c83dd57e74dca5d16503bffdb37db58 SHA-256: ff3023afd06ac12d315fcfb8badfffc56683a4c3328b436d463cc16b45f5e5bf
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The primary attack pattern involves luring the user to click on these links, which likely leads to a phishing page or a download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/123?utm_term=zheng+rule+34 In PDF document text
    • http://operationhomeplate.com/63856446440tsrac.pdfIn PDF document text
    • http://artemk.ru/multi_stream_recycling8qyvb.pdfIn PDF document text
    • http://everydayy.fun/emblica_officinalis_medicinal_uses8bboa.pdfIn PDF document text
    • http://kersita.space/rememitopo442rc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453336/normal_5febe1c3e2d9e.pdfIn PDF document text
    • http://expressday.online/manual_del_conductor_de_new_jersey_en_espanoljn1y1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450512/normal_5feb4c6725a0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407807/normal_5fdc9182d13fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462678/normal_5fec45ada8f9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471686/normal_60072ec0751f0.pdfIn PDF document text
    • http://geosen.net/peloton_bike_calibrationz5b37.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/cerfa_15776_modifiableypvkc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475582/normal_5fe44793631b2.pdfIn PDF document text
    • http://temilops.xyz/stick_cricket_live7ps7k.pdfIn PDF document text
    • http://academic-club.ru/car_carburetor_tuning3w041.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393508/normal_5fccf0ea1b5f6.pdfIn PDF document text
    • http://bhd-management.space/taforodoxujogogatufts4y9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001a63b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A63B 84532 bytes
SHA-256: 9eac1cb157bdda781a4ba94e5dd18d0f0f97a7d723533d28ed224c932ef623f1
font_01_sfnt_off0002a01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A01E 4768 bytes
SHA-256: 16de8ffef133d3c0530bbb1968c44d241a0c2615d663d0f038354e5a2074b801
font_02_sfnt_off0002b064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B064 13876 bytes
SHA-256: ecbd312a70dde1b7341e23509faadd7202073e476d5dad580390922d7a5ff048

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