Malicious PDF — malware analysis report

Static analysis result for SHA-256 138654db9cfbdb7c…

MALICIOUS

PDF

72.8 KB Created: 2021-09-15 21:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 573fd6f4ad8a28b94cfff810861e8014 SHA-1: 25b8a809aa0a330a7e2ed079dbdf3e787488b59e SHA-256: 138654db9cfbdb7cdee577f8ddc1ed06947a506ae3e5db8e462476a82dd9e5fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lead users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8129

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://phongthuydotho.vn/upload/files/rosezudema.pdf In PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/sezezijunavivituzud.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/52993539844.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/fegipafozuziwe.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/lepajezixilikes.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/gasulegejatomaki.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/42330314972.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614070fe93b8f---gejeduvinowuxewofilulipur.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/2559159343.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/jafisuwezapimevibez.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/74127344906.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/wosomolirugodipobavaf.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/16234359465.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/wixesalev.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/fafabusifakilokese.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/94543004286.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/basalipimoduxeliriwu.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/88430637256.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/59470657924.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb046c504---voxolipeva.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/65090957135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=email+subject+for+resume+sendingPDF link annotation
    • 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_off0000bf1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1A 18092 bytes
SHA-256: 31d17e092a6efa9dc44b0797ffa4f6fd77a04f6f28e07babf4518139e6dac9df
font_01_sfnt_off0000eda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B9 11172 bytes
SHA-256: 1af61769430281501310bdb007e6a379ec17e5eaffc3f37c18a5b9255e3f3c8f

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