Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdfb6ed1970c950…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 11:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cb5021252fe139cc363a8e19e9c2c8b8 SHA-1: 4bbf26064f9e6aa62287ef6119f9a71c16b5164e SHA-256: 7fdfb6ed1970c950a38f5cb54fcc135958b463198c962778ea79b2111af2241b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the presence of a link farm on disposable hosting, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://evohome.pl/userfiles/file/zexamesesodatoxikigek.pdf In PDF document text
    • http://nmways.com/uploads/fckupload/file/29188849595.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/76861915977.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/89105111152.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/wejet.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/sopuju.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090720373342.pdfIn PDF document text
    • http://ed-union05.ru/files/file/monogitiderobisuxikujed.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/31531423549.pdfIn PDF document text
    • https://esvigo.com/upload/files/riwidoxomojurizobegakep.pdfIn PDF document text
    • https://susta.vn/userfiles/file/60132283179.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/tevipubovubakawu.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/jekodarevu.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/kugewilunuvira.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210909011049_4lj3ct.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/lipewupoxesiwutimanidate.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/bokoj.pdfIn PDF document text
    • http://abnicum.com/files/file/53810302372.pdfIn PDF document text
    • https://redac.ch/upload/pokaxepilivukawegaworutek.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/givedisoz.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/dilawod.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/45749799296.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/gebepilemuxefitide.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/tapovebomevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=qemu+windows+androidPDF 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_off0000caa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA7 10512 bytes
SHA-256: 58b3267afd1a60b00edef43f1215a1f1901e9f7a4d7f7bb4f3f1eab30782243a
font_01_sfnt_off0000e2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 17752 bytes
SHA-256: 030b3154b5ed24ef757b15690e329a4fd231d27cd2f51469775dfca5c8de25b3

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