Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7db41d0f7436a4…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 13:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7d362a602143c87e4423beed91206f3a SHA-1: 04303eb02c9536ab5be85191f2779dbc9e122d8a SHA-256: bb7db41d0f7436a4eab70ddf8a6d38de0707df6d0dfd33da84d5d197f36dd416
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links, likely to manipulate search engine results or redirect users to other malicious sites. The embedded URLs, despite some being marked as benign, contribute to the overall link farm characteristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://yjeverspeed.com/userfiles/file/22157558997.pdf In PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/24006979212.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/77865214921.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/3297d8addd411c4b4d3d5b0e10edb6e2/39731461766.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/libupuxuvomojejobele.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/20264159405.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/75067899652.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/9915008939.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/pazere.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/kurasozawiza.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/93033371471.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/71291919010.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/99562002086.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/40233349220.pdfIn PDF document text
    • https://unosms.us/userfiles/file/pakunupip.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/jejewebiwuloruju.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/6795011886.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/30323270579.pdfIn PDF document text
    • http://potya.com/fewixomupezixajelapo.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/mozisipe.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/wujetakowuref.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/41995f2d8519284a55b76467ead9c6c8/janawenulegegerip.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/30647940472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=god+of+war+chainsPDF 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_off0000aedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDC 16224 bytes
SHA-256: 5e78694c3468beb296ee27eeb7f3f874a429a60e17e068efe0816f859e902877
font_01_sfnt_off0000d795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 10424 bytes
SHA-256: 5dfbe86581a1289f0efac690fbdf31c5f789d1ccf5dd345b15ec82a047900a88