Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a35280e67fc5bc…

MALICIOUS

PDF

70.7 KB Created: 2021-04-04 16:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3586a636e931c98a72e7406e0dae7c24 SHA-1: 22bc1396de116fae13c0b07efa631ca7622bc128 SHA-256: c8a35280e67fc5bc44b32291c70c95cee26a264460c1983bd7ff6640ba444cf0
194 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'https://yafferge.ru/wix?keyword=ceramic+series+by+helen+of+troy'. This, combined with the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics, strongly indicates a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wix?keyword=ceramic+series+by+helen+of+troy In PDF document text
    • http://zawateminito.iblogger.org/bihar_census_2020_district_wise.pdfIn PDF document text
    • http://fisutef.iblogger.org/lofepukewiwukuduwegidozul.pdfIn PDF document text
    • http://zuwujamoruwipam.22web.org/why_isnt_samantha_in_the_sex_and_the_city_reboot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_3d8c40e09f4e49ebbef08cf46e2ea9af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebisop/norstar_phone_manual_change_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22230408-de8a-4c3e-891a-df3b17c2d026/microsoft_visual_basic_for_applications_extensibility_5.3_excel_2016.pdfIn PDF document text
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_d9c43307ac714a89a95f61737747a509.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/ballymaloe_relish_nutritional_information.pdfIn PDF document text
    • http://wajoran.rf.gd/zapisipumofenezawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dfcd623-d84b-4f40-b189-986afbe75de8/fikumifademi.pdfIn PDF document text
    • http://wesakuboviku.epizy.com/aqa_psychology_a_level_textbook_year_2.pdfIn PDF document text
    • http://disewenijogexiv.epizy.com/39706589586.pdfIn PDF document text
    • http://zokitamuna.epizy.com/pufegiwubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d756d525-7edd-44d7-a4cc-c7b0b4627b50/jofakawu.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/uss_answer_key_2019_malayalam.pdfIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_bebc09c9d6a14f6c927b5158cdf2eff8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/lupijusisogebegoruvebe.pdfIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_cabfa4ba01784f488b8e22f06b2b4a60.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/arsenal_vs_psg_goals.pdfIn PDF document text
    • http://mevomum.epizy.com/mpg_video_converter_mac.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_4b29ea9891554d5b9b485f81409675be.pdf?index=trueIn PDF document text
    • http://dimesagir.epizy.com/how_to_descale_nespresso_essenza_mini_machine.pdfIn PDF document text
    • http://gevotuwelu.rf.gd/42_murray_riding_mower_belt_diagram.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_off0000d55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55E 5268 bytes
SHA-256: dafd7090d3222e13300a7358bf58203851fc60a0e20ec54f650cdc838f581dca
font_01_sfnt_off0000e721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 10760 bytes
SHA-256: 0671ad4ef4d3d89ac557c96205019052a667d6a8c9f044ccef9ed4e3bad75f09