Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a454d88adb1d972…

MALICIOUS

PDF

88.3 KB Created: 2021-04-22 10:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b820ac8d2866cf7ba4113226a4dd735f SHA-1: da9b5eeb4f8cba46b6686ca8ee5472b34dc3c1b9 SHA-256: 6a454d88adb1d972dfac0db3e2ce751641e870faba7942d01280135cf8b088ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://zajinet.ru/strik?utm_term=where+can+i+donate+second+hand+soft+toys PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405946/normal_5ff9c5599d365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444353/normal_5fdb2cb48ff7b.pdfIn PDF document text
    • https://sarotokatot.weebly.com/uploads/1/3/2/6/132682281/8773b.pdfIn PDF document text
    • https://lepimezuraz.weebly.com/uploads/1/3/4/5/134599896/jesozuv_beveli_bizezegipimute.pdfIn PDF document text
    • http://bidepugujem.22web.org/amplificateur_diffrentiel_cours.pdfIn PDF document text
    • http://zomoxesami.22web.org/yasuo_build_guide_s9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mitufesidu.epizy.com/xakobid.pdfIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_5fafc5bd234d409fa3752f241ae6c9ff.pdf?index=trueIn PDF document text
    • http://bijaxufima.epizy.com/7414666736.pdfIn PDF document text
    • http://jukasiwatan.epizy.com/images_of_gandhi_salt_march.pdfIn PDF document text
    • http://limoxukuk.atwebpages.com/anti_lock_braking_system_report_download.pdfIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/mathematics_for_economics_hoy_solutions.pdfIn PDF document text
    • http://xufeguwopox.rf.gd/ielts_writing_task_2_questions.pdfIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_fd345e8d8ce442c1939015a68db7ba3b.pdf?index=trueIn PDF document text
    • http://jeludugaj.epizy.com/niwobezerexunalidewuxev.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F55 4980 bytes
SHA-256: f324c37728198e74bc8b5458963b68063dcb2dfce6301d07f6e6df2724d1b10e
font_01_sfnt_off0001203f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203F 11124 bytes
SHA-256: 9d1eded771a4e9eaebf0312c6b143e03cabae5cf65471b9b91fd6a65b9778f89
font_02_sfnt_off00014642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14642 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3