Malicious PDF — malware analysis report

Static analysis result for SHA-256 67977f34c12aeb6e…

MALICIOUS

PDF

76.0 KB Created: 2021-02-21 02:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c8917e0e3fa9c3bbc34e159f786af0dd SHA-1: b49686139b31dfd010310ba5377cfa03b6b20293 SHA-256: 67977f34c12aeb6e290206f8433e1ad7296e1ec68ea4ee5dc5860ad5cf3dbe83
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains multiple embedded links pointing to known malicious redirector infrastructure, including 'https://yafferge.ru/wix?keyword=dell+digital+delivery+application+review'. The document body, though heavily obfuscated, suggests a lure related to a 'Dell digital delivery application review'. The presence of malicious links and ClamAV detection strongly indicates a phishing or malware distribution attempt.

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/wix?keyword=dell+digital+delivery+application+review In PDF document text
    • http://meetlait.pro/86958675394auh5v.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/cDhihcn/muse_healthcare_application.pdfIn PDF document text
    • http://cartest.pro/wexixiritigitepibe0fk2y.pdfIn PDF document text
    • https://cdn.sqhk.co/nilofixogezu/iergjE2/46166072251.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/BifUif4/tolixosat.pdfIn PDF document text
    • http://shopsupergood.site/a_levels_biology_textbookt6tv8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_601eff9e70020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417315/normal_6024041299063.pdfIn PDF document text
    • http://formulamoney.top/wiworigosufigutugogo24kqq.pdfIn PDF document text
    • http://levantemosaic.com/wugosexomefebaliwon0bn1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387050/normal_5fd67ceae2457.pdfIn PDF document text
    • http://biomaniix.website/51398758557kn0ox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373755/normal_6006ab12ac15f.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/VgiEgXH/78471292491.pdfIn PDF document text
    • https://cdn.sqhk.co/vofonowul/djaegjh/train_driving_simulator_games_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449406/normal_602b5b4885970.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pomababotesu.rf.gd/3rd_grade_math_worksheets_long_division.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_off0000ec33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC33 5316 bytes
SHA-256: 9aa7919e0c6da02f7e5a8ae49f6552f3bf9002e8d6e7eb8f24ccb77ae3b713a3
font_01_sfnt_off0000fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 10428 bytes
SHA-256: 12cfd4d064d4f824a97be0c81ae32f1cf42381e0bb16889fe678dda44536d96d