Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6784ffdd1fc732…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 18:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 565f30c69ab08c5b111796f5e6ecb04a SHA-1: ad79d1680dbba7a1a434e39f2b0bbfa6e2149d36 SHA-256: ac6784ffdd1fc732653169273af3524f8d14af9695a3505b1276c754e1e2e455
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The presence of external URIs and the ML classification strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/673136196.pdf In PDF document text
    • http://indecomavo.pl/userimg/inc/20042701728.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/minagogewovowewu.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/50021988954.pdfIn PDF document text
    • http://client.diffuse.info/files/wumowepaniwevisug.pdfIn PDF document text
    • https://stopserv.ru/files/file/vufevujumonamanupim.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/63577925498.pdfIn PDF document text
    • http://freestyler.cz/img/file/kijos.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/xagetufulaga.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/neder.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/fab379c28a4e44426105894689bd844e/robuzanupetutux.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/1715600029.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/molizu.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/gazakaxefumulunisariwam.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/93961907013.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/jutimijotoju.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/27100823831.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/26440065025.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/kenezokeroki.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/36368455689.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/f9pqsmvp1au9kf97nj1rv3qnm0/92355526959.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/rerekemonujevolar.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/zirukiwenawewigikowotoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=naruto+shippuden+ep+30PDF 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_off0000d324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD324 19216 bytes
SHA-256: 211c87b8b64ba1ccf4c6aa024b356283f950096da2c57b7f15122bbe1d03d3b5
font_01_sfnt_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 10812 bytes
SHA-256: 5657ea7b3047e5bee260694ea9975ebbacebb3da8a81dc0cd603e1cf5588bbc1
font_02_sfnt_off00011d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1