Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a9316513f1d5f4…

MALICIOUS

PDF

76.5 KB Created: 2021-03-23 17:32:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b16d583f363640e012cc5d435cf5d819 SHA-1: 284fbc84f9c46b6ff914d710b747b6cac670451d SHA-256: a8a9316513f1d5f40379ad5c299e543d18e2733aca54b38f5bc99e75f6093118
126 Risk Score

Malware Insights

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

The sample was detected by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is described as a link farm on disposable hosting, indicating a strong intent to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

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
  • 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://xajibur.ru/award?keyword=martha+alicia+chavez+libros+pdf+gratis PDF link annotation
    • https://cdn.sqhk.co/gutipefu/UojidCj/97056706394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491439/normal_601b59f2e0654.pdfIn PDF document text
    • http://universal-kirov.ru/physical_science_p1_june_2018_memo_grade_10scpgq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368999/normal_5ff88b069e8e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_601432bcd70c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376598/normal_5fe4cab371237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481999/normal_602fe6fe6eb43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447276/normal_60184bc502378.pdfIn PDF document text
    • http://vir-tus.com/old_adventure_games_pch5dkp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472182/normal_5ff4e08b0410b.pdfIn PDF document text
    • https://cdn.sqhk.co/kekazorub/SihRVhe/puwapunozipuzewapeboj.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/babetafaperaxov/extent_report_latest_jar.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/suzigosunibi.pdfIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_27c0dfd7bf404575a72b8f03faf7fd51.pdf?index=trueIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_c1bb9dc626ed4c01bb03b39bceceb2a1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/safago/porejutiwomi.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_off0000e88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 5672 bytes
SHA-256: 7d4c24518ca3cce10438bc1738d667a3e409043d6551d90a5ffb689b378a3bb4
font_01_sfnt_off0000fbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 11988 bytes
SHA-256: 73dab7ca788f644ce43527a91d5df1ded8449f844eefc2ee61623b61686f28d7

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