Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2d78c9263cda91…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 14:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 16f17e008e1b692c013f984df99cd2e2 SHA-1: fefd8b70b7ec186a8d0f096b6ec337ea9978358a SHA-256: 5f2d78c9263cda91af5194f7e8a425fbdf811a39036e1abac0ba76d8c469c7e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm designed to obscure the final destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests a deliberate effort to create a deceptive structure. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggests the PDF is likely a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://natanashoes.com/kingkong/userfiles/files/68363525482.pdf In PDF document text
    • https://sportsslife.net/upload/ckfinder/files/nujorid.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/kejutipibituxe.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/78690130713.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/68494753131.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/jatanegebebab.pdfIn PDF document text
    • https://ibextrail.com/editor-images/govijafesetanenaja.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/11845782115.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109140845292468.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/pufuwapew.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///wuzabuditivuteki.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/jixuwemitup.pdfIn PDF document text
    • http://strihaci.cz/userfiles/file/begiramikodepuwawimutot.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16140f5b5a46d9---79511448011.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f10ed401b---25473753872.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/22089233781.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/nurorapuvanasew.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/16245125191.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/jewawapa.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/vukegivoletawizinudoj.pdfIn PDF document text
    • http://blccy.com/userfiles/files/48394518086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mi+tv+software+updatePDF 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_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 10588 bytes
SHA-256: aac061b9abb59aae85f200b339e8c3c076fd9e06d8a40154f67f79d49af40d9c
font_01_sfnt_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 17356 bytes
SHA-256: 2d46eb8ed98781c756ba96f73aa5208875c55ea8622bd6b7b07a5ceae1b50f7d
font_02_sfnt_off00011ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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