Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2728ed34c10f3e…

MALICIOUS

PDF

75.7 KB Created: 2021-05-02 02:40:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4e3e7acd28238c55610fcd895577ca8c SHA-1: 7c7c7de9510a0461bc97ca1b174ee1a3dc79e3e6 SHA-256: cf2728ed34c10f3e53497ac711acc9e626a72408db6d20524748a8204939a19a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with one prominent URL being `https://pelibifir.ru/strik?utm_term=schumacher+battery+charger+instructions+se-82-6`. The document body, though heavily obfuscated, appears to reference 'Schumacher battery charger instructions', aligning with the heuristic that the PDF is a link farm designed to redirect users. The presence of embedded JavaScript, indicated by the T1059.007 technique, suggests the potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=schumacher+battery+charger+instructions+se-82-6 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380229/normal_6003179a795d6.pdfIn PDF document text
    • http://instapodarok365.site/rainforest_hd_picture99ol9.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelenid/lbbRABh/71489751304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405414/normal_60152d19dd3b2.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/gehfjgu/91715313647.pdfIn PDF document text
    • https://cdn.sqhk.co/femokuxajuz/Eohf8jg/hangman_movie_plot_2017.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370304/normal_5fde5e1bb159e.pdfIn PDF document text
    • http://dvertsoff.ru/relitakuwapenarizukkgo9o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464700/normal_60082035c0452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410983/normal_5fe80c29bbfcf.pdfIn PDF document text
    • http://construt.site/goruzijogalidotobinovunaxwqsg.pdfIn PDF document text
    • https://cdn.sqhk.co/muribirigim/iqehbhc/newematukakupokopozojupox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502511/normal_606ae7fd1f3f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_d751cb2a4c0f4afab5012b72e1e0cd97.pdf?index=trueIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_cfa2560ec7234741a315d9ebd3154ad4.pdf?index=trueIn PDF document text
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_fdb33035f60c4d6f90b8e11203b78537.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_2feac66098d74f58a76f670649f6c306.pdf?index=trueIn PDF document text
    • http://medojowibapij.epizy.com/58206218058.pdfIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_4d00abfb0d044a3fac3740e3eded798b.pdf?index=trueIn PDF document text
    • http://pimokizogo.epizy.com/prefixes_and_suffixes_exercises_for_grade_5.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_off0000e7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 6036 bytes
SHA-256: 6b9ab6fe29f85069c4c6bcda593208be9f04924500f3006bbe9b8d43a8f8f3ed
font_01_sfnt_off0000fc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2F 10944 bytes
SHA-256: bd6852451a90a32af06d4fa5683a16249cbbd5433d601eed7f76ca0dac1f1790

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