Malicious PDF — malware analysis report

Static analysis result for SHA-256 738ee8a79c5ff05b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 12:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d43593936fe2bfaeacde889e41f6853f SHA-1: 9d8683370685f33d99df276e821bd3131ccaf257 SHA-256: 738ee8a79c5ff05bff3cb64b5012ed44bf5117b067f09153fcc0ea23687da5c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, many of which are structured as link farms designed to redirect users to further malicious content. The presence of external URIs and the overall structure suggest a phishing or malware distribution attempt, likely using a lure related to common technical issues like Android USB connectivity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/uplcv?utm_term=android+usb+not+connecting+to+pc
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/wiwaziposapog.pdf
    • http://fusen-es.info/yamituki-n/uploads/files/76597859514.pdf
    • https://k-newsletter.com/ckupload/files/fupikotazarabo.pdf
    • http://venus-forever.com/image/files/wimim.pdf
    • http://www.de.ruben.pl/ckfinder/userfiles/files/36801097497.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdcf3668ee---wuwojetaxulaj.pdf
    • https://gs-hemeringen.de/ablage/userfiles/files/sawetivejes.pdf
    • http://ags-sib.ru/ckfinder/userfiles/files/jararipixef.pdf
    • http://zhizhencn.com/filespath/files/20210909034950.pdf
    • http://snp-ent.com/files/fckeditor/file/1103466414614688d897bdf.pdf
    • http://farmaciafoglia.eu/userfiles/files/nirife.pdf
    • https://superpart.com/files/58217289590.pdf
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/59675449430.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/373a152a87ebee8aa1807e180e2310cd/zafesasif.pdf
    • http://terrietanaka.com/library/files/64104941743.pdf
    • http://szyqjsj.com/UploadFile/file/20210917040530205.pdf
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/nepogixekufewizidovasas.pdf
    • https://valleyrentals.com/userfiles/file/barapal.pdf
    • http://autoscuolauniversale.it/userfiles/files/nanarivoroj.pdf
    • http://greenglobepms.com/uploads/kovode.pdf
    • http://ciatic.saintelserver.com/archivos_editor/file/8909392831.pdf
    • https://emmaushuis.org/pages/61413344004.pdf
    • http://didula.com/img/file/42677049555.pdf
    • http://geobigoni.it/userfiles/files/vulanerelewavazugiwevowi.pdf
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/xalapijezubenaviro.pdf
    • https://yodishit.com/uploads/userfiles/file/91984773809.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_off0000d49e.bin
3fb212d9ca347067a4853078913fed1975adfa145783c8fe4c24a15b88f2fbb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD49E 16928 bytes
font_01_sfnt_off00010065.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 16792 bytes
font_02_sfnt_off0001187c.bin
78c07f0ba095042f06357cc12f512fae736c46397e9addc5c4ca1c293360dd94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 10704 bytes

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