Malicious PDF — malware analysis report

Static analysis result for SHA-256 0449f969bcb58bb1…

MALICIOUS

PDF

73.1 KB Created: 2021-09-13 20:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4b2e72b6d5503a5ff052f66f7515af25 SHA-1: 801cc7f1b6c4fb2db15ec6292ba1411847340515 SHA-256: 0449f969bcb58bb19baa2c418b04b9fed170b5ef8e7c48eff4abdc1b9de1a7dd
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. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The primary attack vector appears to be directing users to a collection of links, likely to facilitate further malicious activity such as phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://makassitools.com/userfiles/file///64077616864.pdf In PDF document text
    • http://netmode.net/app/webroot/uploads/files/72023923643.pdfIn PDF document text
    • http://cissi.it/userfiles/files/94008364452.pdfIn PDF document text
    • http://www.polni.si/Images/files/norudedabidomun.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/susix.pdfIn PDF document text
    • http://erex.hu/upload/file/80014656029.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/85146502947.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/88268551005.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210910/file/19273549960.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/xulemojepida.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/38883449888.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/15147798455.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/geboxufasafajiduzeririso.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/66329366689.pdfIn PDF document text
    • http://topp.pl/_topp/file/9115480151.pdfIn PDF document text
    • http://fgosvo.ru/files/files/zugasuvewijudo.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/67337720580.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/vitudezija.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/25560715892.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202108311929423559.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6927092fe---butuzevapalogivamiwebot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=principles+of+financial+accounting+3rd+edition+pdfPDF 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_off0000b8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AC 17124 bytes
SHA-256: 821ed6b26f625a9b084d85b6e1055016aee005b75855dc3d3755f14d257091a8
font_01_sfnt_off0000e53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53E 11068 bytes
SHA-256: e8b7ce5038f0efa2d9321a3c8068299287a0ba306cd0515b500b001ad6646949
font_02_sfnt_off0000fef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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