Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd54df7442f9fae…

MALICIOUS

PDF

77.1 KB Created: 2021-03-11 19:15:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a0637b953b0aeb6c0b8f40d467bdd726 SHA-1: df1ee024377c4974082684718c1eba5217f2df58 SHA-256: 9bd54df7442f9fae82e6abd2047d431f4422e80efb2a61095638b4d02235158e
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/award?keyword=adjectival+and+adverbial+clauses+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369788/normal_5fc76fd4c8776.pdfIn PDF document text
    • http://nisebitedogofu.iblogger.org/60847589232.pdfIn PDF document text
    • http://dejijesumewir.22web.org/tojakirasexa.pdfIn PDF document text
    • https://nobarolibefo.weebly.com/uploads/1/3/1/4/131407117/6714747.pdfIn PDF document text
    • https://cdn.sqhk.co/novozefox/iigfehf/mududuranategodax.pdfIn PDF document text
    • https://cdn.sqhk.co/sawitofi/oifbohb/12996065630.pdfIn PDF document text
    • https://murarukaxew.weebly.com/uploads/1/3/4/6/134666391/9461036.pdfIn PDF document text
    • http://fastcreditcheck.info/59279593818unz2v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425759/normal_5ff8a72265ad2.pdfIn PDF document text
    • http://adv-workshop.site/392433576633hpoj.pdfIn PDF document text
    • https://xavidupi.weebly.com/uploads/1/3/4/7/134723560/febivososet.pdfIn PDF document text
    • https://cdn.sqhk.co/wotabefej/zehcUjg/1557249041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_601f6a00a2c39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484995/normal_6020a72b382c0.pdfIn PDF document text
    • http://cryogen.me/68189447288axw95.pdfIn PDF document text
    • http://kind-insta.site/99199249854e0od.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488317/normal_60436d13534c1.pdfIn PDF document text
    • https://jibukosixej.weebly.com/uploads/1/3/4/0/134018053/fomidabafukis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417414/normal_600f4a6d3bf77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366993/normal_600646d1b8db5.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/hcyjaha/screensaver_for_samsung_tablet.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://tujanum.rf.gd/40674597989.pdfIn PDF document text
    • http://lafeseg.rf.gd/67077016008.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_off0000e3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B8 5184 bytes
SHA-256: db49917e106ce38b2d69afb75558dfb2beb5c9274eaaf83632f6da3f7f5ed7a2
font_01_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 10364 bytes
SHA-256: 3bf735da76c6753615a62b978d31998b27f3e2f6c75ef4539d372efd197a51da
font_02_sfnt_off0001189f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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