Malicious PDF — malware analysis report

Static analysis result for SHA-256 42578f9a469103eb…

MALICIOUS

PDF

78.2 KB Created: 2021-02-25 19:52:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b9dbfd8d617aa9679540a9281f8c63ee SHA-1: 17fa2b3163383d7f988e22fce05f7f0de9aaf736 SHA-256: 42578f9a469103ebc1eccc1e80f757ba9a9a24b7efa7746793cb28e0de2a5532
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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/award?keyword=square+d+9013fsg2j24 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4405953/normal_5ffd869bd917a.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/77162298748.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410214/normal_6006408ae54a8.pdfIn PDF document text
    • http://verification-help.com/joining_letter_after_maternity_leave_templateavjnr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_602b59c419e41.pdfIn PDF document text
    • http://c-advance.space/bollywood_song_mr_jattot9su.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/purajewilepobixuk.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/suzipep.pdfIn PDF document text
    • http://delaem-sami.online/bachelor_degree_in_information_technology_south_africab51jl.pdfIn PDF document text
    • http://cloudplay.xyz/kulasumadebodabbhcyp.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/radio_shack_scanner_mods.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382966/normal_5fd784c1e14b8.pdfIn PDF document text
    • http://purpless.vip/pexofixulijevibupejhxu6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujapoguxesak.myartsonline.com/motuxagoxujefirunagovu.pdfIn PDF document text
    • http://bitines.myartsonline.com/56757115439.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_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 6084 bytes
SHA-256: f60b8987ee73d70dacdd19ee51f820b325896e46e4c1656f3f10fb19fc59abbc
font_01_sfnt_off0001087a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 10424 bytes
SHA-256: 21d3adde66c7cfdc62eec40d7388b7b4a87430ab719acfb470d408575d39d2e3

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