Malicious PDF — malware analysis report

Static analysis result for SHA-256 9669af50098ae06f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 11:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 984c6a890d216ad22147f479fbbe72c8 SHA-1: 1cb4859086c390e8a96d500f4940f84701cd5b87 SHA-256: 9669af50098ae06f9d2e855d82f718f5b14a697a972243e71f62bd683b220a4a
146 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains numerous external URIs, including one pointing to a raw IP address, and is described as a link farm on disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of multiple malicious links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.alcera.ca/userfiles/file/logef.pdf In PDF document text
    • http://cw-cut.com/uploads/file/48131578530.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/ditidivasabad.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/4178647285.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/dumuwowujuwidojoduvik.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/ledekafagarosojoj.pdfPDF link annotation
    • https://igraonica.me/userfiles/file/rawixakevogasawivaz.pdfIn PDF document text
    • http://cocoal.com/uploads/file/25291041393.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/nujugexelosojir.pdfIn PDF document text
    • https://kokomanis.com/contents/files/74465546639.pdfIn PDF document text
    • http://liyangah.com/Upload/file/5952484178.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/77976414833.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/96593857798.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/sidimikizufixa.pdfIn PDF document text
    • http://es-iyashinomori.net/yamituki-n/uploads/files/88300537169.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f0da295928afab5aae610bcb29ccfe9f/59672093582.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/nigorireluxatelolav.pdfIn PDF document text
    • http://getem.eu/files/file/batokigavogigojejij.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/83270994944.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/8719792503.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210912220624.pdfIn PDF document text
    • https://edusfera.pl/upload/file/91551186983.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/tiwinedinu.pdfIn PDF document text
    • http://gnox.vn/upload/files/xuwudoxizaxisevuluvodivem.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/wejul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+use+free+fire+mod+apkPDF 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_off0000d112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD112 20220 bytes
SHA-256: dd906ea805fc50a9e75619e665eff6c7bcc67b1e98b16f5767c0eec0ee5f760f
font_01_sfnt_off00010679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10679 10776 bytes
SHA-256: 557dd933155e422dab6355c7f6b1b0d43f2ae447c3226a97ffab3259f6d52f40
font_02_sfnt_off00011f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1