Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf872e34cc261810…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 15:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d0e2c6996520cfd42bb922f7151549cd SHA-1: 8eb1f75ed5bef3f8fae31e127c3d251bfb5d3bf7 SHA-256: bf872e34cc2618101037adc181f41f03101b064d71c788064d84e6acbff14762
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. ClamAV and ML classifiers also identified the PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://dobrejaja.com/Upload/file/sovatuzolofanituno.pdf In PDF document text
    • https://powermailer.in/userfiles/file/gopomuneke.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/65287165269.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/66418468292.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/jitudanejivivoxarezusup.pdfIn PDF document text
    • http://vaynhe.com/upload/files/26885103289.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/42414478592.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/fafoxikuve.pdfIn PDF document text
    • http://cjatkinson.com/userimages/rekarareze.pdfIn PDF document text
    • http://finchamauto.com/pics/kabaxorux.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/31591517786.pdfIn PDF document text
    • https://aildf.in/userfiles/file/mukupiduv.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/26287153732.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/rrutjf9d84jos1rrrlfp5bg395/84637563484.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/menimupomopijenowaroza.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/41992156394.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/29009848188.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/tewawususozepinagoket.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/vatudowuvi.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/73092988230.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/mowezajapewawugu.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/wuxutuxodadure.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/99611416311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=html+and+css+duckett+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD24 17880 bytes
SHA-256: 147377f13a87046c13b5243ca900f0210222678e43e7f49b94d58f081c08a1ec
font_01_sfnt_off00010bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12408 10652 bytes
SHA-256: 2bae3859cd7270b84d7e2d255918f8ffe4df6016016cb837ab9c2290a9ca4852

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