Malicious PDF — malware analysis report

Static analysis result for SHA-256 3895764a65e53aec…

MALICIOUS

PDF

69.0 KB Created: 2021-09-27 10:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 36af5d147775b7ecff1692fc1ea4d55b SHA-1: 44d7f935748722fde7e052eed8979bf13aad965e SHA-256: 3895764a65e53aecdff7323823b6397e2e7dbc61f5402b6423d60421f5cda72d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/uplcv?utm_term=top+10+android+games+list PDF link annotation
    • http://say-international.eu/userfiles/file/70365906018.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/bobam.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/72933687806.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/9925029713.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/33998453614.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/53273839859.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/50052837699.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/77125477509.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/7767882134.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/55955936257.pdfIn PDF document text
    • http://nanopena.cz/upload/file/92695021754.pdfIn PDF document text
    • http://htygroup.com/upload/files/nikirizomilu.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/85779710077.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20219251358341986.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/zagakejuso.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/kapujoxixugikakap.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/cbeaec174f7f3555b59434d9cb989f15/2355112695.pdfIn PDF document text
    • http://innersolutions-uk.com/file/jidamaga.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/12691041435.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/11514312384.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_off0000acc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACC1 16052 bytes
SHA-256: a07a450fa4132b6054eeb84b323fd43fd27556715a6c61706b67d8b72e1fd7f6
font_01_sfnt_off0000d58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 10872 bytes
SHA-256: c990625f1e3f42b12e45cb61e54ed2fb35e68528eb8c59cdf9403a6245336435
font_02_sfnt_off0000ee70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.