Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa7e99da5bc00e1…

MALICIOUS

PDF

84.7 KB Created: 2021-03-31 13:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 25d63aac76480b269fe6661294079c00 SHA-1: b86884b570b1cc26b90e5a802ee73f31f93f54b4 SHA-256: 3aa7e99da5bc00e1b356537141969698b8d1d2dd3e45249a68ccfd5683d3e458
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of a download-related lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards a malicious intent to redirect users via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/123?utm_term=booty+farm+mod+apk+2.+3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473903/normal_605f9f7e4181d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385026/normal_60119adcb4706.pdfIn PDF document text
    • https://wigimosasalak.weebly.com/uploads/1/3/2/8/132814057/gazut.pdfIn PDF document text
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/fuvamazokob_noxeje_wapinuwaxowiwe_filavafesiben.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448976/normal_5fce5ede2d807.pdfIn PDF document text
    • http://tukiviretek.iblogger.org/55449412072.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/73f91697-39dd-4d64-9925-c0ef4f8d3448/97952264304.pdfIn PDF document text
    • http://zagopemolal.rf.gd/bodybuilding_workout_routines_for_mass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/345abe24-7432-4a3b-b007-02700a33577a/11172185077.pdfIn PDF document text
    • http://gefuxexo.epizy.com/13370734048.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_f9c9f48965b24782aac81928830245c1.pdf?index=trueIn PDF document text
    • http://joberuxedi.epizy.com/94873173680.pdfIn PDF document text
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_7659d11f48e04916a579d911709b614a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3c4a97b-46ec-4040-b637-902512f7605c/lagotuxuwaziposuni.pdfIn PDF document text
    • http://xazujimex.rf.gd/doc_mcstuffins_bag_template.pdfIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_5d5a1451e918461fb3e8a7461707df3a.pdf?index=trueIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_dcb9ab49e24c4f43845c1962e053d39b.pdf?index=trueIn PDF document text
    • https://7a6021ad-ea99-40b3-bafb-6570e045b460.filesusr.com/ugd/527ec5_2d03e665441b45c1a14ca64c00360599.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEA 5036 bytes
SHA-256: 5b9ede90219c699301575c631510a2374b11a9ec31a0e6c05504f982b743703f
font_01_sfnt_off0000fc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 10748 bytes
SHA-256: f85893f17a906fd420ba27eb980c1e29b5c29ca9402e380435d2825e8e479cf7
font_02_sfnt_off0001213d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213D 16272 bytes
SHA-256: 4c975c5751d073bbd60a759b5637c12b3f0d2165ec89dd4f9c4a1c39a7d182e3
font_03_sfnt_off000136d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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