Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c0dd824ccad3dc…

MALICIOUS

PDF

77.0 KB Created: 2021-09-19 15:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6503409861807fdffd2617e68f39e3de SHA-1: 5b80accba2875ca21a6efe2564e287164ea48b58 SHA-256: e5c0dd824ccad3dc181f738b6dcfcb2d9121216dcfd97bc8f3f69614b7cbfea1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites, likely for phishing or malware delivery. The presence of external URIs and the link farm heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=hk1+tv+box+firmware PDF link annotation
    • https://economiadecomunion.net/ckfinder/userfiles/files/zobedizuxixi.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/jaguwuk.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/wuligedodijow.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/vutagawo.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/xetidilapelepavukonet.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/xalibemulido.pdfIn PDF document text
    • http://kbchina.de/upload/43103315560.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/tizunefagadenisibetojod.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/89212937752.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/seraxav.pdfIn PDF document text
    • https://patc.fr/imagesfile/41410238910.pdfIn PDF document text
    • http://waypl.pl/upload/File/19083136858.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/nilofifesidenulejaxafegel.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/retekonenubenizudigu.pdfIn PDF document text
    • https://geloracinta.com/contents/files/dazomomusizoloni.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/63956028678.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/guwudatuta.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/satimeguxuterapo.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/71465621637.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/rimusiwimanudura.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/e2fecc1a0c25f4b4ffd7f37eb0445507/lovuzigobi.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/gosupevax.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/bofefutexa.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/gigapaporogegoj.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_off0000c6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B7 18196 bytes
SHA-256: 860b5207a2c53b19d1ca2b46b3273191ee29b51ecdb5d7f9b793def6e1a4e1d4
font_01_sfnt_off0000f5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 10584 bytes
SHA-256: ab1ff5c6bc2955f65d0fbb808e3038b8d7b9cf8bfb38ef5585908fa2aa2669c6
font_02_sfnt_off00010e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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