Malicious PDF — malware analysis report

Static analysis result for SHA-256 2719c1c8bba5d1f0…

MALICIOUS

PDF

76.9 KB Created: 2021-09-23 18:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f63f7e6cd4bba30069d5c12e9e6a6a5 SHA-1: 7c1f62cecfb40277f69256143e58168246f5bbd8 SHA-256: 2719c1c8bba5d1f0e959c81f47520ee882155adfa014754cbdaea6e217c39b77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of multiple unknown URLs points towards a campaign distributing further malicious content.

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 http://studiosiciliani.eu/userfiles/files/zisuzolow.pdf In PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/31009027721.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/jidafikovafar.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/324525983.pdfIn PDF document text
    • http://fittbikese.hu/files/file/94326602180.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/wojexinulidazalop.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/55692808662.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/26465497630.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/86697625249.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/varobizigutugarefizek.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210921_35A4FADAEC0F8A38.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be710f1534---55968868203.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/63679680798.pdfIn PDF document text
    • http://plncse.hu/php_data/file/tularixa.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/punupijupemekavikolud.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/mokumalijuregabolizoma.pdfIn PDF document text
    • http://only-svet.ru/upload/files/kuvitox.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/dopadorekekisenukisoguv.pdfIn PDF document text
    • http://gaudi.tw/upload/file/pajekesasuloxevadopuwa.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/varefotilusa.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/jemakafogunijuvilikexodav.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/fifugejazu.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/59759522294.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/dccb0dd903b63ee742d9633769bdbec0/72741173854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=minecraft+pocket+edition+for+laptop+free+downloadPDF 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_off0000ca34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24B 10616 bytes
SHA-256: a2d22b2b9230e13e90f4dbee8b33a8134a303717368140d013751d37aa163cc3
font_02_sfnt_off0000fab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB6 16584 bytes
SHA-256: b9cb1313bad77c6c701d1db641d15fd53618d890de13c91cafccd2b6edb47090