Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e59b038b338bd71…

MALICIOUS

PDF

72.3 KB Created: 2021-09-22 23:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed43a95b16b5028c82f5a53dff1106fc SHA-1: 58bf2e4a68d2d3f2f2c253162326c3591b47edcc SHA-256: 9e59b038b338bd71d0d2572e532f463be63ce19c65d18c55a4480a7b37937495
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://allytemp.ru/uplcv?utm_term=mi+a1+call+recorder+apk PDF link annotation
    • http://faw-asia.com/image/upload/files/kixidovowoloxoragez.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/kuginusoden.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/51291380626.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/pitamekugaxemevof.pdfIn PDF document text
    • https://ratosatu.com/contents/files/sonejoruwekotidu.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210912085851.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/dazemomuzagapuj.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378a043bd68---18906357124.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/tefobi.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210910_094546.pdfIn PDF document text
    • https://jensbrode.de/files/file/lekukomizo.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/89374890840.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/lunivemevabimilexowomuto.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/jukisa.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/3819687670.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/powinegifupekubofawas.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/xaxitutawakuzad.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/gevofikuz.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/31007661795.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_off0000b8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C6 10276 bytes
SHA-256: 218a4d8d5920539dac57be7e7e5d5cfbc1cdc9c99c787137077a392a7223bd09
font_01_sfnt_off0000d001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD001 17304 bytes
SHA-256: 4430ac0db8af75958c6c1849bacaee348e7e9f8da710c945c860dae506a4c7a7
font_02_sfnt_off0000fc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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