Malicious PDF — malware analysis report

Static analysis result for SHA-256 275ef8f9f5e81782…

MALICIOUS

PDF

78.5 KB Created: 2021-02-28 03:50:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e6bcf42e8a405db3e05577e294bc864a SHA-1: d311daa39c068ca5cf2a257dd03cc1dca9d2bb4e SHA-256: 275ef8f9f5e81782a12564b7ae12dbdf739c16724f7f52ec66a3b76d44dce5e2
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to book rankings, likely intended to trick users into clicking the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=nicholas+sparks+books+ranked+best+to+worst PDF link annotation
    • http://rbqjkwklnd.xyz/804276886133viab.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwikiw/aijIhhf/gedija.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492281/normal_6018e2945dd6f.pdfIn PDF document text
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/dasebugapod-butubexazawi-nowovigiwat.pdfIn PDF document text
    • http://fastdonwload.space/47873361399fg2oc.pdfIn PDF document text
    • http://reduslim-ufficiale.website/infinix_note_8i_price_in_nigeriazo40x.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/xalexojaxipud/git_all_commands_cheat_sheet.pdfIn PDF document text
    • http://gagonunanu.epizy.com/babemalujetowaf.pdfIn PDF document text
    • http://rinotox.rf.gd/wogikanojozatawavabibuzo.pdfIn PDF document text
    • http://pusupap.rf.gd/hester_biosciences_ltd_research_report.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_off0000f788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF788 5424 bytes
SHA-256: f6eb0bfd667d3628de1c479a1bd007337f420e96c443025f7076b17c8b68c476
font_01_sfnt_off00010a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A06 10428 bytes
SHA-256: 62904545a50e9e89fedd5ce5b03a24e9728201d4ac9f26c45bf8775f27853744

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