Malicious PDF — malware analysis report

Static analysis result for SHA-256 d199565c98288add…

MALICIOUS

PDF

71.5 KB Created: 2021-09-17 03:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 990c5205accb72aa10f3eebe971204e6 SHA-1: 0ed278e864644d3fe9e65cb3c479c051f15d32d9 SHA-256: d199565c98288add8c4971d1f21221f576370fcf1bb78c68119aa73ae6504e14
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs point to numerous other PDF files, suggesting a distribution or phishing campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic findings strongly suggest malicious intent, likely involving the exploitation of PDF viewers or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://muszempilla.com/files/file/84922061012.pdf In PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/9550785682.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/8550968059.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/50128064866.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/37560470329.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/pafibej.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/26566696511.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/57789911274.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/penawilamisunojoz.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4296c9341c54bf93bd250b4a0c5ff20f/96625262874.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/wopobitokatafenogumutoreb.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/mofamawolowagirakipa.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/povivikoberodumalopuvumu.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/96759354461.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/wipiraped.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/renefupewapa.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/pawawomujazaxavaledibu.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/55852146471.pdfIn PDF document text
    • https://rinducm1.com/contents/files/48407731473.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/gonitimebutowanizozusi.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/nisavemefameme.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/ligejenugo.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/88457364545.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/junisefe.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/rudanosesotomurevofida.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/vijixepopavus.pdfIn PDF document text
    • https://latework.cz/soubory/jirurasikapot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=10th+maths+book+with+answersPDF 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_off0000b91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91F 15148 bytes
SHA-256: 032ae6d9c8bbd3bea26458ec38217ca7efd4ed486847d16a9dc967facad58906
font_01_sfnt_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 10720 bytes
SHA-256: 0a8cca49e377b87007ce904518a4ff8d53937701dec25473ef0d69ea01f3fffe