Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6504b480e460901…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 15:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 115cd395dcf1acde33a3ed069882adbb SHA-1: 8977c8f7795e3302f9975ca94d9a2c8f220c6008 SHA-256: e6504b480e460901c60e2b97fc3ad24c22c0b1808a452cf49298dc597bdf82b8
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. The embedded URLs, despite some being marked benign, point to a pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://eco-versute.com/app/webroot/ckfinder/userfiles/files/48747786413.pdf In PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435b65e8ead---29568094505.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/nogewike.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/somuvixibazozobisujiboli.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/25453481032.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/senozidolimexatup.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/jopunilosop.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/55338383997.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/piranoso.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/31005665355.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/22507226132.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/kesemodoxitaxu.pdfIn PDF document text
    • https://steammining.com/userfiles/file/dusazevolub.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/94569736686.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/zunesasuj.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210906183831.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/45848246002.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/59364247075.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb33eb87b6---ladusuxoden.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/polapepakaboludazavetonin.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/kavatakas.pdfIn PDF document text
    • https://termofriz.rs/files/91426519526.pdfIn PDF document text
    • http://myesen.life/userfiles/file/40267263345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+reboot+phone+without+power+button+and+volume+buttonPDF 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_off0000d868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD868 18372 bytes
SHA-256: ef88222e90dd49dc50ac64a226414e4efcf22cea42733255698109607c31ca49
font_01_sfnt_off000107df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF6 10872 bytes
SHA-256: f424ab0ec857939a892eb3654f457d52278011870308228a2744a5e73e1db29a