Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cbebd34b00f3a6…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 02:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 422fa04906cb58da4ab97b7ddda27bb0 SHA-1: 6eaa4383beec148731119439e7992a790a2aaf5e SHA-256: 83cbebd34b00f3a644309eae4c0869841ddeb5946ada873f4288080b8986fe02
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious attempt to obscure the true destination or distribute content across many domains. ClamAV also detected this as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML classification indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://korea-labels.com/ckfinder/userfiles/files/wekamokilenuwaxamonekevog.pdf In PDF document text
    • https://ecoledesgourmets.com/userfiles/file/86106760728.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/31292505345.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/37164463640.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/mokejowanipevelexuduniv.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/vegiwo.pdfIn PDF document text
    • http://cga82.com/admin/File/78250100357.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210906235249105.pdfIn PDF document text
    • http://ashioke.com/images/library/File/dexezixilegi.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/41860820605.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/jibuzi.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/82377246345.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/nevifajawitoxezig.pdfIn PDF document text
    • http://pmke.cz/pictures/files/poguzepawezepi.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/bejarozikibamiwodatefare.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/37906564795.pdfIn PDF document text
    • http://agro-partner.com/Image/files/14721491000.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109122338309258.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/mafirafotemuwazali.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a2b04e155122f9ce003c7b355e3050cf/21873720635.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/fidavet.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03dab118c---zagilinumi.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/sepuxe.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/48209240345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=different+muscles+in+the+chestPDF 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_off0000c6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ded3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED3 10420 bytes
SHA-256: 31594ffac920b97c4f5a2c3b2ec36ea282995f892229226d685928bc7f8f6e97
font_02_sfnt_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 17232 bytes
SHA-256: 6c2b9322e4a5205edacdadcce67971da8747685f95ee65c29a45f34ba2dea79a

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