Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e7c2cdec247e10…

MALICIOUS

PDF

77.8 KB Created: 2021-03-01 04:10:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 90a4dada65067463d1bd49448e61be49 SHA-1: 16d74519c7b8907650bca4ba50d83e9bab267fd7 SHA-256: 33e7c2cdec247e105da5a5e4f898204257cc5f686053edbe3ee35345510f026f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to manipulate search engine results or redirect users to potentially harmful content. The presence of embedded URLs and the overall structure point towards a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 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.
  • 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=enfermedades+que+producen+moretones+en+el+cuerpo PDF link annotation
    • https://jodegometokak.weebly.com/uploads/1/3/1/6/131606115/a7f84c2d0e58.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/dKiao6P/30896833046.pdfIn PDF document text
    • https://cdn.sqhk.co/xedomobedusi/eojbKYL/wwe_2k_battlegrounds_gameplay_espanol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380528/normal_5fe010ed88b1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410186/normal_5fcc3c08c27e0.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/0iexjeD/e_with_accent_alt_code_chromebook.pdfIn PDF document text
    • https://nifilova.weebly.com/uploads/1/3/0/7/130740060/1032803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408583/normal_6017bfb9df9e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_603527e5a4d16.pdfIn PDF document text
    • https://kasewipiliri.weebly.com/uploads/1/3/4/9/134901701/wezebozu-togiruwunul-bisedan-zivipezetir.pdfIn PDF document text
    • https://cdn.sqhk.co/tirazirevemu/4hjbjcf/home_photo_studio_app_download_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466379/normal_60335a8106877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378164/normal_6035e0b9053bf.pdfIn PDF document text
    • https://cdn.sqhk.co/moxawitab/vBnhbVa/torozuzavivatupezu.pdfIn PDF document text
    • http://liwexun.mywebcommunity.org/sixikolepufutoso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kopolug.myartsonline.com/how_to_turn_off_soundpeats_earbuds.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/40303167031.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_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 5384 bytes
SHA-256: fe67ebd0ba1b07f9a245285d43aa782828b0243540038ad27c8908bf587243e7
font_01_sfnt_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 11204 bytes
SHA-256: 7d942840b57b83dd75f6e1307d05f14ecb13afc3535c9a1efc59db60a31837bc

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