Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e834acd56b4d4c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 00:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df495220fca99ce3393a64c90c890012 SHA-1: abc05354cbd1825abf383b324c82407cfde96acc SHA-256: f2e834acd56b4d4c615b465f1cc3b338b8f4743265c4f03ce4835a80b6d7b467
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one specifically pointing to 'allytemp.ru' and using a 'utm_term' parameter suggesting a lure related to 'telegram conference call'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a network of disposable domains used for malicious redirection. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=telegram+conference+call
    • https://cheeselicious.net/UserFiles/file/58730064784.pdf
    • http://transporteslaplata.com/imagenes_web/file/gemixuwotetudopetuwu.pdf
    • https://curtain.jinware.com/upload/files/lixekepewirazam.pdf
    • https://reparationmobile.net/userfiles/file/rutekenumonomekoj.pdf
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/2366932239.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/9ti22t0vcc8ali470fgv2nrjb7/38721953489.pdf
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/19900671255.pdf
    • http://ecohouse-lab.com/userfiles/file/lumevetarewefiwepudatixu.pdf
    • http://meimagedance.tw/ufiles/files/96349745288.pdf
    • http://support-cmu.com/filedata/file/5438542801.pdf
    • https://rajaketiga.com/contents/files/64636913427.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/jebisom.pdf
    • https://mysilo.com/upload/ckfinder/files/40288039843.pdf
    • http://maydemtienvn.com/upload/files/24394485950.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161364d281d5c0---33293534907.pdf
    • https://goodnest.info/tctt/sites/aaa/file/92643345973.pdf
    • https://feniks9.ru/ckfinder/userfiles/files/zezebumi.pdf
    • http://healingtown.org/userData/board/file/95277950415.pdf
    • http://jezirka-biobazeny.cz/UserFiles/File/88022039633.pdf
    • http://densayhongngoai.com/uploads/userfiles/file/vigimelapupegul.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da06.bin
6ecef399d851fe7dcc43f2aee89a107a790046a3f599d58c1ba6dd12094e282b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA06 17036 bytes
font_01_sfnt_off0001066e.bin
f0e1cf5e5c146dd3abdc0d1f9b10aba290685964d9b773bad41928ceec6a321d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 10284 bytes
font_02_sfnt_off00011d95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D95 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.