Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b05666f2fb6e95d…

MALICIOUS

PDF

72.3 KB Created: 2021-02-23 15:52:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f1d17fc43f768be8e181d4f46d13341d SHA-1: 138d82ff3fbe0df4e1bb6ee8ad69dafc365d6f79 SHA-256: 8b05666f2fb6e95debb1f0b8a51ccca5eff54cedb09a754fbf982d611a6cf5ca
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 0.9998

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://baarspo.ru/123?utm_term=schlage+keyless+entry+deadbolt+change+code PDF link annotation
    • https://nojefawagalubab.weebly.com/uploads/1/3/4/2/134266261/2fabe7aa331a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407314/normal_601f41fbc921d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488103/normal_5fff130a6f065.pdfIn PDF document text
    • http://nizalanus.22web.org/86490806545.pdfIn PDF document text
    • http://legko.travel/944381652295klln.pdfIn PDF document text
    • https://cdn.sqhk.co/tijovomiv/ijhfjix/wozawawetetakifesetoti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458161/normal_6026d0197b6ed.pdfIn PDF document text
    • http://cparta.moscow/tribal_clothing_size_chartuxd7u.pdfIn PDF document text
    • http://alifan.store/cfa_level_1_kaplan3vblq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_602002e9ea38a.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/jaogf8C/coronavirus_briefing_today_live_uk.pdfIn PDF document text
    • https://gavofazipog.weebly.com/uploads/1/3/3/9/133999173/kugibilazegozos.pdfIn PDF document text
    • http://taher-tcac.com/49074253391e1789.pdfIn PDF document text
    • http://dayzcommunity.info/guitar_songs_to_learn_fingerstylehst3a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvogixerad.epizy.com/62157228151.pdfIn PDF document text
    • http://jojanotesejivi.epizy.com/gowalexogadonuginof.pdfIn PDF document text
    • http://xepijuxidejo.epizy.com/formation_ceramiste_marseille.pdfIn PDF document text
    • http://ravuxigud.epizy.com/ecology_practice_worksheet_answers.pdfIn PDF document text
    • http://fijazuzid.rf.gd/business_casual_and_business_formal.pdfIn PDF document text
    • http://gedanenek.epizy.com/cartoon_photo_effect.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_off0000dc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC27 5608 bytes
SHA-256: cc52560d14a02f92011b9f54a2bb3c88ea099256e11fd3e1deb20eb3b4b4169b
font_01_sfnt_off0000ef35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 11084 bytes
SHA-256: f6d93adf31e5fc7de59204a33c986a9648f7e7746f7fa062f1040317fd5af3d1

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