Malicious PDF — malware analysis report

Static analysis result for SHA-256 175fcdc9c1a0b573…

MALICIOUS

PDF

71.4 KB Created: 2021-09-26 02:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a04aa3eaacda99140fb733df23a793e7 SHA-1: e0bb1b307e8ad57d6e42fed02367c0395dbfed1b SHA-256: 175fcdc9c1a0b573e097af039bcb8d48e0b8e680ad78ee404168f844de15f439
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many on disposable hosting, strongly suggests a phishing or link-farming attack. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with malicious documents designed to redirect users to harmful sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pistant.ru/uplcv?utm_term=galaxy+k+zoom+custom+rom PDF link annotation
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/katulafu.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/44863478051.pdfIn PDF document text
    • https://kawanmto.net/contents/files/56515656064.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/5124331268.pdfIn PDF document text
    • http://th-hl.com///upload/files/futegowirozebatafa.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/70772859747.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/32801884380.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/39336139758.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/kapis.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/mexum.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/wilawizil.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109050948213654.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109090501042440.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3ba0bc2c4---14375269480.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nimexoluruzega.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/xukitodigibojon.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/88146001962.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/lizobagofu.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/kujidokazijexuwu.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/vobemitololamejanivamuma.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16134d4842ea58---pawofepupumutepopuwakaba.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/34762608535.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33D 17624 bytes
SHA-256: d46345cb09161d588e072137ee77e206b3a479c9229792f8035234a365752db3
font_01_sfnt_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 10572 bytes
SHA-256: b7ddb270de856759febf4fe8d7e8d1958f348917de03714c5c0066bc68d8032f
font_02_sfnt_off0000f793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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