Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4f641a2be23ab2…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 08:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c7eb0d9ad251cc14c50754ed1da02c7 SHA-1: 7dfc9ca52654b08ac7bc5fcf249a9c45f1bafd44 SHA-256: ac4f641a2be23ab2aff2715d55762128d375fad7f3e1f0074b64beb80e112585
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded content to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=get+amazon+appstore PDF link annotation
    • https://mingyi-lock.com/data/file/userfiles/files/fimaliwesepofixed.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210916000156609510bunrr.pdfIn PDF document text
    • http://maksimetall.ru/files/25153633840.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/famewadubizepiratirowur.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/33517615423.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/42982079436.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/04/file/20210904_092516_200.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/76982293474.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/kebura.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/72248841262.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/kizobezevomegakozilud.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/20990325782.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/muvolorewofalowewo.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/66304866986.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/nofafagilelig.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/68544761520.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/86291573847.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/36348118930.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/dalufezurisor.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/eaaaad9f1e86ac7a1b84eae940aa70c1/65999747245.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/sizaterububerevebizugemo.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/66712583117.pdfIn PDF document text
    • https://iwistw.com/upload/files/xodim.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_off0000c9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C0 18532 bytes
SHA-256: dfea86d3b115402f51dc3346f51e89a649f508c792da9b5f200d0e6c1f4e57c3
font_01_sfnt_off0000fa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 10372 bytes
SHA-256: 38c418962814e37b2c243620325013c9bd4f3f08f879896eba8902df64727278
font_02_sfnt_off000111be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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