Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66316d95915bd99…

MALICIOUS

PDF

100.4 KB Created: 2021-09-18 06:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df419aabc70f832744fccbf3ca6d779c SHA-1: 671642de3d13718080b2220dac665038080bdba7 SHA-256: b66316d95915bd9929bb3c08cded656c3cd0c061bdb68f173984629281a3c331
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely attempting to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://abwrichmond.com/uploads/files/nupaxabamidotepag.pdf In PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/255f86c98e65f789d9acc7862ef07673/27686394832.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/veweperom.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/vebewitovap.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109101552556027.pdfIn PDF document text
    • https://vleek.com/uploads/files/xudesalizukix.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/kopifomanaxuwogepi.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091805220737.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/24035905659.pdfIn PDF document text
    • http://artediapharma.com/upload/files/60194631440.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/naxawebaparikaranixa.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/78948892885.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/nidatuvetewu.pdfIn PDF document text
    • http://www.polni.si/Images/files/baperomanudalufukanibuz.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/74822330810.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/werumanepimomakek.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/rolejowifibab.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161450fb6e6bb7---majake.pdfIn PDF document text
    • https://blokhol.com/upload/files/wedanalixebukasato.pdfIn PDF document text
    • http://fnathservices.com/upload/file/kopijowumu.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/fitivepikesivulasefatoto.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/43797894022.pdfIn PDF document text
    • http://scsychem.com/upload/files/51507082662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=avengers+infinity+war+full+movie+sub+malayPDF 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_off00011cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFC 20124 bytes
SHA-256: 3904230bad529cd6655fa4c3a293920a4ff55fdd8ec822006eef5179aff3fc7f
font_01_sfnt_off000151a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A1 11044 bytes
SHA-256: 483e85721c9fd319535c84bb22604ba26be720bfb14a49915e11ff77f92b0734
font_02_sfnt_off00016b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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