Malicious PDF — malware analysis report

Static analysis result for SHA-256 59733055fc7ca57c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 11:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5115f0c98ac5a6678a09f08df03eae52 SHA-1: 308f0ae8fc753dd211cb2a30eb319a0404b205ed SHA-256: 59733055fc7ca57ce74630f6637172fc941b52099546ed04a9d67a13fd3377e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of external URIs and the overall detection profile strongly indicate malicious intent, likely involving directing users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://laborke.ru/uplcv?utm_term=puffin+browser+pro+mod+apk+2021 PDF link annotation
    • http://hightopeducation.com/cms_uploaded/file/tekofomotidomagejiti.pdfIn PDF document text
    • http://hmed.vn/upload/files/26770898553.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a69211313a---sisezazaworif.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/foxiloliki.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/kuzeravimaziwo.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/50935064307.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/vajeguregagitomavela.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/67389872101.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/ludonol.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed63bd83a3---xosebalukalomiragogogumi.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/renudunuvodubi.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/94870110907.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210907130041998.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/zisetotimemugixidozuvuja.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/56834303879.pdfIn PDF document text
    • http://fxlcd.com/upload/file/mowekomevi.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/21457737411.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/bakipazetibimetuke.pdfIn PDF document text
    • https://promoform.coreform.it/uploads/file/23322942547.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/pulerozib.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/68288722549.pdfIn PDF document text
    • https://salonrewards.ca/images/file/japolowonitiwe.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/57332525096.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/nigaroxiwij.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_off0000d8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E8 18396 bytes
SHA-256: 0417ce0eb02122eb05753ea16765c13afba85d74355df758a2861af1eedb7348
font_01_sfnt_off0001092e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 11228 bytes
SHA-256: 478677004d5d9b480dd13b3d8ab7112586c4fcf448885218582f65129315e77c
font_02_sfnt_off00012363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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