Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8aaa59121e4b92c…

MALICIOUS

PDF

80.7 KB Created: 2021-03-13 15:33:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 468600b824b43bab79d00cb87b9f62c6 SHA-1: 78498442ab08dedbfa86789a96b28c62ce3268e8 SHA-256: f8aaa59121e4b92cc86b8f860ac9bdb7ce68863bce047e0bd074af7a7da7e490
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The embedded links, such as 'https://yafferge.ru/award?keyword=asma+tratamiento+pdf+2020', are designed to redirect users to potentially harmful sites. The document body is heavily obfuscated and appears to be non-readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/award?keyword=asma+tratamiento+pdf+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4427783/normal_60464a0113744.pdfIn PDF document text
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/wixijowamen.pdfIn PDF document text
    • https://cdn.sqhk.co/salaseli/ha6ifnw/icon_clash_nike_shorts_pink.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422631/normal_5fcb21ec8af7e.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/irjgQZv/34172306084.pdfIn PDF document text
    • https://jimigafekalese.weebly.com/uploads/1/3/1/4/131407537/4847125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411218/normal_601eb8b5a42fe.pdfIn PDF document text
    • http://ropufowi.iblogger.org/81111933686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5fd65435c6507.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419654/normal_5fdeb508ef5e1.pdfIn PDF document text
    • https://wazaxilam.weebly.com/uploads/1/3/4/7/134726650/ratumu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/3116505168.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/calvary_reformed_church_orland_park_il.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_9ec495ffb1be47b6a0d0287facbc55dc.pdf?index=trueIn PDF document text
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_88efa94855214a2a939a928ce485b976.pdf?index=trueIn PDF document text
    • http://jenenulufem.rf.gd/kibofenixumuvimizerezovon.pdfIn PDF document text
    • http://somukagokololu.rf.gd/kundalini_rising_book.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE807 5416 bytes
SHA-256: 7ce73527220d2dfaa5dd3c56740eddd00f329898e1d6660bdbf54aac5ea6ad09
font_01_sfnt_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 11028 bytes
SHA-256: 29f69caf306831eaa313893d1c305d51ec5ea895cc18700c2f952009a6c47275
font_02_sfnt_off0001205a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205A 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e

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