Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e8c9be827d22af…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 05:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 004df97e984e99856cf8a4527ed81c41 SHA-1: 6eb0f3d8eeb22e431c4da770f5fbdf5d4eeeb229 SHA-256: 93e8c9be827d22af7d58c7a9e4ea764d3002282cbc2fe8954854a17ff0331560
154 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a high number of external URIs, including one pointing to a raw IP address, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=french+ligue+1+matches PDF link annotation
    • https://hbfilm.ca/resimler/files/28142379844.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/famoti.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/ruritikemalakizoxukelu.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/rigigajisomumam.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/notodulamogoketiwujeza.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/81594696554.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/29564834709.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/989379087.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/kidorofujubalemitinopa.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/gupawivi.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/81985054795.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/j9eno4jvbdkr59qblhnbdf66e3/68702232163.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/62550183252.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210904_015919_180.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/vimotedegugagizuse.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/20504394179.pdfPDF link annotation
    • http://tichdiem.surecare.vn/uploads/userfiles/file/93952412707.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/zefotirabegugiromubiko.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/66717547466.pdfIn PDF document text
    • http://ebus.cn/up_file/file/lapagakurigaveriz.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffabe34676---besigefig.pdfIn PDF document text
    • http://totoumi.jp/upload/file/ruwujolid.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/kekubasifeweto.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/barurovalegetanodow.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/89288096897.pdfIn PDF document text
    • 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_off0000d8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 10684 bytes
SHA-256: 7faae12dc0884c87ba81a16425e4dabc57d7e43c43148424127d24ee8de4fe07
font_02_sfnt_off00010929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10929 18300 bytes
SHA-256: 2977e96df80f9d79615146fff930c70ffcf9e181fe302503b13f9b53e895dd5c