Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08e4e72733bf7bc…

MALICIOUS

PDF

84.2 KB Created: 2021-10-05 01:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 03e55a8999cbee4e8e957a053f7b23ff SHA-1: 2c22cd77b2d946e8f08f9742e77c427be7d864c8 SHA-256: c08e4e72733bf7bccb3bca5f7de90ff768453cdf8630cbcca578bb52ad486055
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, suggesting a phishing or malware distribution scheme. The embedded URLs point to various domains, many of which appear to be compromised or set up for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://archism.ru/uplcv?utm_term=come+to+the+five+and+dime+jimmy+dean PDF link annotation
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/a2d1bqqoeh2bufdqdm9d1ao15v/zizoxilidi.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/ralowigatimati.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/bba5976821540ca13c6ceeae500ead3b/ruturiwudivufo.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/82731374871.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/75986359652.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/funasunodefijezuxeguliton.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/fufuvutir.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/91118109445.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/jagavuxidu.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/45881958254.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/mugazokugumeje.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/zovexopumubonotekifiz.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210911015549.pdfIn PDF document text
    • http://wernitznigg.at/files/4058051223.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/tebabunosaf.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/xevujexetudowubejuwodi.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/99856257694.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/25/wewejijonemudamabawugu.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202110011203373760.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/2327786699.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/80876001586.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_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 10648 bytes
SHA-256: a2105337d300329c2a803a3f9d3465cb68678c7855a58e15d7c4f6d34dcf1948
font_01_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 18280 bytes
SHA-256: 6f0c5118fef4b0289eda1d1aeadcb15e5bb18b7e07cdf20690e0e165e3ac1b0a
font_02_sfnt_off00012ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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