Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8acb7923fd05e7…

MALICIOUS

PDF

77.5 KB Created: 2021-03-06 05:34:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e6382c84ecf4f78c0b1ef318700e0816 SHA-1: 29b214b02099d722f2f57f0497182d315ae20106 SHA-256: 0b8acb7923fd05e7d66040f4f8d658b322ccf5b1de669f63b01467f2fbc6d5ab
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with one prominent URL pointing to 'leonvi.ru' and disguised as a search result for 'George foreman grill cooking times'. This suggests a phishing or scam attempt, likely using the document as a lure to direct users to a potentially harmful website. No scripts were extracted, but the presence of multiple external URIs and the link farm heuristic point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://leonvi.ru/award?keyword=george+foreman+grill+cooking+times+boneless+chicken+breast PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421336/normal_6026409bbbf81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483337/normal_5fda63e2c2d76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450724/normal_5fecfe14c21cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474997/normal_5fcfb35d19879.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/W2gdgcY/66996155003.pdfIn PDF document text
    • https://cdn.sqhk.co/tirewaku/gBce6e4/31731681190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497395/normal_601094742114a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449187/normal_5ffcfb6f45ab5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476272/normal_603400b1a61e1.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/fjjZgiV/tovulamuwijabagakujugemu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427085/normal_6032818f2fedc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zipituvopedisi.rf.gd/wazixexa.pdfIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_58aaab1e6fad4136a965b21fa278d017.pdf?index=trueIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_8b8e6ccdbc10452eaf03d9a5b77dabe5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74da6d4b-626c-45b4-8bfe-18b9e359e27d/8284607260.pdfIn PDF document text
    • http://lugopupi.rf.gd/what_are_the_codes_for_element_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26126fc-b8ce-4f86-b4cd-7ccd044a194b/lifoxo.pdfIn PDF document text
    • http://xunawikavamenu.epizy.com/gobivute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/696c020f-4a52-40f2-97c0-ee677f1ed842/how_to_fix_afterglow_headset_mic_lvl_3.pdfIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_7bff8ac951024e538fb623975e05a98e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfbb1a47-ad6d-4aa5-8c64-77794990b80d/propiedades_qumicas_de_los_materiales_ceramicos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa236684-e2ab-4a98-ae8c-21986dddb77f/where_to_donate_furniture_during_covid_near_me.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_off0000f133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 5528 bytes
SHA-256: d1228f355830dbae246e942e9adb022fc0bfc96641bcacb878dc41cfb59a3762
font_01_sfnt_off000103dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DD 10736 bytes
SHA-256: fe745379c908265961b542ad582536e57e884cdf13b05248c71fa951d3c1f272