Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aaebf3d76625722…

MALICIOUS

PDF

77.8 KB Created: 2021-09-18 08:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ade77a4d88f7c4b286c8eb56249f6c8e SHA-1: 2f31092346b2410210ed572e1ad882162981d67f SHA-256: 9aaebf3d766257221a17f95528a47ca55a424fb10c3cb19d4a7538a741bd3161
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful sites.

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 https://benmoonpharma.com/userfiles/file/46945916727.pdf In PDF document text
    • http://chafewyuok.handysociality.com/upload/files/vamigovalu.pdfIn PDF document text
    • https://castel.ro/userfiles/file/77928428341.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/95443451137.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/55786146058.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/vjk4au77v2i0f9jci3lujcmrdp/64848411135.pdfIn PDF document text
    • https://sambelteri.com/contents/files/tusenubogelaniwizuf.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210904134129_378230265.pdfIn PDF document text
    • https://wrd13.com/force/file/44287730070.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/zuvewozedejubud.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/35238804016.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/bujagezipagemigagibetosi.pdfIn PDF document text
    • https://suruburi.net/mm/file/vibitin.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/18482091023.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/durugarugesir.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/7988262115.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39346291462.pdfIn PDF document text
    • http://bushurov.ru/images/files/soxetopopopudib.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/62884269495.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/wesidamurawatewugasez.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/taxakozozov.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/33621795701.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d01314b97b---51376737644.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202192031112234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=breakfast+story+gamePDF 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_off0000c509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC509 10576 bytes
SHA-256: 0f0f1cba83bdb76bcf8c356d1e3d18b099ba378595404dcd7c0b2bbc54e1f79e
font_01_sfnt_off0000dd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 19776 bytes
SHA-256: a5883bc97c7570f1e6fc1f3485c0adaa6a3ba69409329596071ab485af2409b1
font_02_sfnt_off000111a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1