Malicious PDF — malware analysis report

Static analysis result for SHA-256 1570a216a00df955…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 04:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d296472034f9d56bc14b5210e5c88b7 SHA-1: 561c653a52ca11ee41b589ff89325c3b8001b25c SHA-256: 1570a216a00df95523470aaa8320cfc62cf38707cb4bd0fc05c360a78c2fc3eb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, many of which are hosted on disposable domains and function as a link farm, suggesting a lure to download further malicious content. The presence of a 'download button' heuristic further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=tekken+5+apk+free+download PDF link annotation
    • https://digiconelectronics.com/media/75941444647.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/vadasobulujefizofito.pdfIn PDF document text
    • http://kyea.org/imageuploads/19359644463.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/39737763169.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/tejaxan.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/noxusenuvesini.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7dc1c4ff6b8c263fd43ada0923d8f031/78354286814.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/23241543160.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/pugodunerapi.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/dububavafegokobisedisaje.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/46960514625.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161348e67ce981---45630608182.pdfIn PDF document text
    • https://mackbeks.com/files/file/34410691267.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/loberup.pdfIn PDF document text
    • https://partnermind.cz/images/files/8461636292.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/71183435983.pdfIn PDF document text
    • http://tzsunup.com/upload/wipexepiromaser.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/97527141787.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/mawogojukiz.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/tonekude.pdfIn PDF document text
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/82491444002.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_off0000d52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52A 10408 bytes
SHA-256: 1dc61546c4a35e113a9bc7429ed9e2de0b42c6445a81315be4022f28cf3bab19
font_01_sfnt_off0000ecf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 17864 bytes
SHA-256: 763d7673910b43237cec54797d6a1b43450fdedd9c7f455c69fb606c6bd1b6f4
font_02_sfnt_off00011acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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