Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb697b95464819a…

MALICIOUS

PDF

81.2 KB Created: 2021-02-18 15:35:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2dca13c0e2c8b598fd7540ed7b1364cd SHA-1: 4edb28cdd83063d95493395c8411ac0c97b8a9ed SHA-256: efb697b95464819a721890ff44691b4dc8b0f119ff8d83d84021dc99b919376e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of multiple suspicious URLs suggests the document's primary purpose is to redirect users to potentially harmful sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=what+is+the+plot+of+there+will+come+soft+rains In PDF document text
    • https://kolenogu.weebly.com/uploads/1/3/1/8/131871799/dosojodip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414159/normal_60006dde77326.pdfIn PDF document text
    • http://pexiwaz.iblogger.org/79200099342.pdfIn PDF document text
    • http://diwizog.22web.org/davediga.pdfIn PDF document text
    • https://vafopizinenited.weebly.com/uploads/1/3/4/4/134480139/602547.pdfIn PDF document text
    • http://itawomen.fun/grundig_s350_manualbcafr.pdfIn PDF document text
    • http://mavavuvew.22web.org/bleacher_report_epl_predictions_week_7.pdfIn PDF document text
    • http://prechambre.xyz/internet_radio_software_free26xkt.pdfIn PDF document text
    • http://espaceabonne.com/a_christmas_carol_charles_dickens_freekr0ov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wenadudik.rf.gd/codice_catastale_comuni_italiani.pdfIn PDF document text
    • http://lovafis.rf.gd/facebook_lite_java_app_free.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_off0000fe9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9F 5360 bytes
SHA-256: 8645cbc61d4ea401bc0ef5d243a1b50a36c9739c95b24d0747a6f585261871ba
font_01_sfnt_off000110cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CB 12068 bytes
SHA-256: 20f963bd252a561e26b22bf185e3caca4bafe6ee9aae4e2927aa236375a5e4eb

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