Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ed8e5cd6c41421…

MALICIOUS

PDF

67.1 KB Created: 2021-09-21 15:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7defad8097ae72af82dfef842fb591c8 SHA-1: daca29e1b780d9059c778d5ddc5c0b4effac3c6d SHA-256: c0ed8e5cd6c41421405b8a05b06e36d215f4748f26f7236f5b6df235a0414ac8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to PDFs hosted on disposable domains, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF structure indicate an attempt to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://longhoang.vn/upload/files/67218556551.pdf In PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/lexedosarajegobeb.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/74913994493.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/sujotonofin.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/49588429636.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/semusix.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/84796153957.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/debovuvan.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/7564531091.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/10261961868.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161369ba44c622---kizexubeloxuduwuzosu.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/gomekagepijixegit.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/73504425561.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/zakinopujaburixu.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/95549913757.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/33098698545.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/lokifuxobad.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/lusemofowarefi.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/47125547287.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/83972257879.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/fireluverixezukuxikunoju.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/kabekulumuwibozibixuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=movie+downloader+androidPDF link annotation
    • 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_off0000ace4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE4 10120 bytes
SHA-256: 8ad3bd182581a3bfd6ea9a906661007e55baa2d7d07e351849364b2a2f5fc9f3
font_01_sfnt_off0000c395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC395 14412 bytes
SHA-256: 2daa5142f57fa272ada55acc6e70d264f35265342eb0d6a50e2d90ffed4effdf
font_02_sfnt_off0000e725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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