Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5aaecd3f55db17…

MALICIOUS

PDF

83.4 KB Created: 2021-03-25 14:14:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 81c76105158cae33bb047f0f3e051bfe SHA-1: 89c705f7c5129f22e060d46a2e002121c94ac79d SHA-256: df5aaecd3f55db1733958cbea2600eeafba10d2405b84cc9eed71b608b3597b9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://ponafet.ru/strik?utm_term=what+is+the+series+dark+desire+about PDF link annotation
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/munidos.pdfIn PDF document text
    • https://xamatokixixite.weebly.com/uploads/1/3/5/3/135336409/67f00b60dcd77b4.pdfIn PDF document text
    • https://jodalutuz.weebly.com/uploads/1/3/4/4/134444421/kejojo.pdfIn PDF document text
    • https://regujume.weebly.com/uploads/1/3/4/3/134339948/5455513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461497/normal_602428a88210f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391047/normal_6053876fc0da8.pdfIn PDF document text
    • https://cdn.sqhk.co/sidogorego/XhiaUi7/82794315929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415524/normal_5fe6cf78e8387.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/mgjXdRW/farkle_score_sheets_printable.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404966/normal_5ff770c1126a2.pdfIn PDF document text
    • https://borusolu.weebly.com/uploads/1/3/4/3/134327960/titudovebigepiditit.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://bowupezik.epizy.com/xotatimufof.pdfIn PDF document text
    • http://borarujedumamut.epizy.com/bomba_estereo_somos_dos.pdfIn PDF document text
    • http://wetusadesaxoni.rf.gd/rinoxozitaz.pdfIn PDF document text
    • http://kofufinaniba.rf.gd/buckley_v_valeo.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/cisco_ise_3615_datasheet.pdfIn PDF document text
    • http://jitawalidi.epizy.com/42883815525.pdfIn PDF document text
    • http://depevabevidot.rf.gd/33491825987.pdfIn PDF document text
    • http://lelirovosas.epizy.com/runinaxefawu.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/biblia_reina_valera_1960_en_linea_con_concordancia.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_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 4872 bytes
SHA-256: 3e8a72b89df8c688f848eae02d3adc342c86fe43698295104848217272f5459e
font_01_sfnt_off00010670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10670 13144 bytes
SHA-256: d621262b55c131907e05d909f7b550393d75c4e46fe03950452e3473f15185bf
font_02_sfnt_off00013068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13068 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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