Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f168be5be24157…

MALICIOUS

PDF

67.8 KB Created: 2021-09-28 16:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1020e2e65769a5255795ea9b17885841 SHA-1: 78306b57d76f56de3a0bc2f1b5a5fee1f44e9b33 SHA-256: 19f168be5be241572bd58c9e44d933bf7407a37828054dc3656e0858e7e4f732
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable domains and employing UTM parameters, suggests a link farm designed to obscure the ultimate destination or to improve search engine ranking for malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://tvtamminhphat.com/uploads/userfiles/file/zabun.pdf In PDF document text
    • http://chi-kara.net/userfiles/file/45954472904.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/mevexumer.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/mesetes.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/savegetawuxefolozesafeze.pdfIn PDF document text
    • http://jucal.es/images/file/mexuroxisamusonipovoxan.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/96046383273.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/xonizudutokafajitotug.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151d5ad4513a---vopivetapebesope.pdfIn PDF document text
    • http://www.celso.org/download/19424435583.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/latezepara.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/pavubusakinanuwovuv.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/4244451aec2a8a7450e6332dc212d678/fefiwavez.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/linerawaluperelawaruti.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/rupikutegukijetisebulo.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/28887633863.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/32367995861.pdfIn PDF document text
    • http://alkanboya.com/files/file///60282205666.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/tejikud.pdfIn PDF document text
    • https://digicpictures.com/downloads/nevaxu.pdfIn PDF document text
    • https://recrut.com/files/files/58971592358.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/78402430439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=coc+gems+hackPDF 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_off0000ac2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC2F 15120 bytes
SHA-256: 8f7734250db798fb15daff2e0493d0602d9b2bb20de1b24a9c1eaf6185c78e1b
font_01_sfnt_off0000d2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B0 10360 bytes
SHA-256: 5c737e0394932b2f3b97ffa955ca0e30c3282dc87a72a84a63e0b89f4d371b2e
font_02_sfnt_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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