Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea4f8fd02822a6c…

MALICIOUS

PDF

73.7 KB Created: 2021-09-18 06:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1a0d533e2b4b3b809dce478b062a5ff SHA-1: 87934041d28e997bf73b466b183762789ba3b112 SHA-256: fea4f8fd02822a6c7eb3c6bfa49a062978069ba419139a565284d3032e65fc5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious or disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the phishing/malware distribution hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/bfb8ruimfcvolrdkd4b5g6akcb/33002550836.pdf In PDF document text
    • https://pjkconstruction.ca/images/file/wedifigisopok.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/tudalilofeg.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/12972232072.pdfIn PDF document text
    • http://erfansari.ir/ckeditor/files/files/xareketaxe.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/zobilajowezogazudaju.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/65823456073.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/58032669529.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/23529812762.pdfIn PDF document text
    • http://prota.ru/upload/files/72983903933.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/fofilowiwena.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/6e3rhed1of4e5k62epg99aeigu/roromukinibezasixire.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/49935350520.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/25734011780.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/vunibikonom.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/kexapuk.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/nevixefotezilo.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/62812888132.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109080127044474.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/61094482338.pdfIn PDF document text
    • https://fasaac.org/temp/files/lubalaki.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/xozopetibuxaguseg.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/marupofavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=smart+tv+3.0+vs+androidPDF link annotation
    • 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_off0000bee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE5 16456 bytes
SHA-256: c838aac623b162d21fd6b0fd9888b332db2b9a1db80f0d2325475ecd0ae7af68
font_01_sfnt_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 10732 bytes
SHA-256: 076bbc6dfb9144e7c825c59317e5ebbb31f071f5470dcc55d9c2528e9e785de9

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