Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1817f8bc609bb0b…

MALICIOUS

PDF

76.4 KB Created: 2021-03-27 18:10:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: be8440511485492baa5d05274afd19a5 SHA-1: b52c76740a735031eccdb6efd63804df6166004e SHA-256: f1817f8bc609bb0b6caca2edec608ed60231c1b0554b79ecca09596604ce8e8e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged 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 or SEO manipulation scheme. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's primary purpose is to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://bologen.ru/wix?keyword=jc+cooks+bike+shop PDF link annotation
    • https://cdn.sqhk.co/kamavedes/hghujaz/navionics_europe_apk_full_cracked.pdfIn PDF document text
    • https://zuveravovizopow.weebly.com/uploads/1/3/0/9/130969477/vigeze.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/how_long_is_the_invisible_man_book.pdfIn PDF document text
    • https://tulosiwawi.weebly.com/uploads/1/3/5/3/135326734/a39d37eff19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_602736ff9a6aa.pdfIn PDF document text
    • https://ridimejaxokixis.weebly.com/uploads/1/3/5/3/135340331/d769b6550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_602f428d441b6.pdfIn PDF document text
    • http://lowabunuzoxa.getenjoyment.net/jikafogogiwomevebusujir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_603fd9e611e0e.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/UQiawgf/universal_sound_fx_download_pack.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/71b6c9a18.pdfIn PDF document text
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/betap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421215/normal_603ef14583ef3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_1c2684e754b8415098cc99b86771c3d0.pdf?index=trueIn PDF document text
    • http://movuzawizigevej.myartsonline.com/biodata_for_marriage_file.pdfIn PDF document text
    • http://vunonam.atwebpages.com/84391191705.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_aaa7a6c2e27e4cec9eebd57dc679c45f.pdf?index=trueIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_9d47217489974ad48ae8466f16e7efc4.pdf?index=trueIn 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_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 4876 bytes
SHA-256: 4e587e79e39c8d25f1362a021fe51ab87505ac0f6fc6d205fc35bd97eb471a8c
font_01_sfnt_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 10540 bytes
SHA-256: 7421d013cf15add23f07575258e39aea42b1dedea982227f20ea423c48f2e092

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