Malicious PDF — malware analysis report

Static analysis result for SHA-256 2436182dd5a73df1…

MALICIOUS

PDF

72.0 KB Created: 2021-09-11 06:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 26fc98c013a262166446e05c82338765 SHA-1: 03c92f53a37aa18e9ca29029fe7342cab8fdfc17 SHA-256: 2436182dd5a73df1dea231f4f8272be357b7781b08cf2debe2b80b6f7d2ff830
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of numerous external URIs, many of which are structured as link farms with UTM parameters, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://philabc.ru/uplcv?utm_term=private+dns+android+tv PDF link annotation
    • http://forglory.cz/ckfinder/userfiles/files/83127739001.pdfIn PDF document text
    • https://birudongker.com/contents/files/3902943393.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/23974798093.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/fofudegija.pdfIn PDF document text
    • http://sakra.sk/storage/file/webul.pdfIn PDF document text
    • http://guitarenko.fr/img/files/38882495235.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/dopizixusofabun.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/34152758277.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/nimirisujoni.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/46109057535.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/43416985280.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/92741318257.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/sitoderuderobiladizo.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/wiruguzoduxojonov.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348f4cd1b63---10503055255.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/486107602613ab5305f032.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/vuzajubutu.pdfIn PDF document text
    • http://vodova51-53.cz/files/sobiwazuliza.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137c2f1aea88---fekexisimepunozasivuwa.pdfIn PDF document text
    • http://elma1.ru/!upload/files/27933665019.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/2906453152.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_off0000b7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B5 16760 bytes
SHA-256: 931c434283bee2e2a26666acb7615302f25f325412cc34238985e9fd0d00a660
font_01_sfnt_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB34 10260 bytes
SHA-256: 82f3ffdb97750a4ef8c6386318e23281b8b7234df2ebfcba583d4031283d525e

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