Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f9a3792f8bb7ae…

MALICIOUS

PDF

67.0 KB Created: 2021-10-08 00:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e0d6363114a9a2ef1a137b5d7bedb6a7 SHA-1: 05dd8b98f9d56c9fc366a6976042a240f4f6123a SHA-256: e1f9a3792f8bb7aef7105d7b6096e1eeb14a9207a4b650ec4e3570c563be7960
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and the overall structure strongly suggest this PDF is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://crysiq.ru/uplcv?utm_term=reproduction+meaning+in+biology PDF link annotation
    • http://lnyuanzong.com/uploads/files/20210906202040.pdfIn PDF document text
    • http://jarosi.hu/files/file/19970643213.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c655251b8---sazigivaluke.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/93943812456.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/56403365920.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/superepaxizajigozutor.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/sifavosozukof.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/dufopagituf.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/vedetaketuvefubu.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/gavapuwedi.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/sowowobunixupowenujot.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/84846899939.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/60557082733.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/41664098816.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/61763282313.pdfIn PDF document text
    • https://ysh.my/userfiles/file/44289385315.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/10079178591.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_off0000a9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9E2 14436 bytes
SHA-256: 23af787d43ec191999646560b3aab6cbcc552667dfc23706c881cf7ea5972d60
font_01_sfnt_off0000cdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5ED 11088 bytes
SHA-256: c38252accc903089e9d9d1996eb5f9b6f49b2b910e313086f320e1623547463e

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