Malicious PDF — malware analysis report

Static analysis result for SHA-256 227baf937c47321f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 02:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 79dc350c0d937a9a62670e3b7645acce SHA-1: 7eb406925cef0cd2091430561d321f5d28923315 SHA-256: 227baf937c47321fa85570e820fbd0bca3355a89a18a4ee62b09494498405580
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple external URIs, with one pointing to a raw IP address, indicating a potential phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://gogreenonline.net/userfiles/image/fckeditor/file/zeleliwukufilepadir.pdf In PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/redogug.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/72804139666.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/64069411077.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/rilejazixupewefoled.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/kebep.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/lebirorali.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/selexemi.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/legazozibupepuwaxok.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/8268341935.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/nigedodak.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/651387836612f0aad8f863.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/68280923065.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/pulosibenejijateju.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/52710398369.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/mekukivasifusosija.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/xibedodigarepuzigesusi.pdfPDF link annotation
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613888934f2fe---60660007616.pdfIn PDF document text
    • http://chinalabware.es/d/files/wepasarivama.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/potonibo.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210904_041019_196.pdfIn PDF document text
    • http://szwygs.com/upload/25932319848.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/dumafikutudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=gta+generator+2020PDF 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_off0000de1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 10260 bytes
SHA-256: db3587bd1d157196d68ed1feb89516a9557ab25a2609e42406f18e776d24c275
font_02_sfnt_off00010d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 17752 bytes
SHA-256: afb0ec82f60d72ad3397907e7a90428fff6450b52defee24c6fdc602dc4bc650