Malicious PDF — malware analysis report

Static analysis result for SHA-256 430bc3b791a36996…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 17:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 256b1b082eb57a4c838ba75fb5e9705e SHA-1: e129073a23a64b0d99401ed6273115745a10effe SHA-256: 430bc3b791a36996448261d4dc96c4437c460ee6fac8897a013ae8f89cf0c6ac
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. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs point towards an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=honey+live+action+streaming PDF link annotation
    • http://julianina.dk/upload/file/wosefug.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/mavewaxiz.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/3361257463.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/1506430938.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/xujite.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee8ecb1545---34149861753.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/96274768094.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/difarexiterababaredogiwar.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/69643991719.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/kelubat.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/teteduzeror.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/jidujenopilanuxobu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e297bbd33---ligarorurupupegolofajopog.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/tobibakisezunidugaguwuwi.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/32525834112.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/19926656633.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/3380724123.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/29964760179.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/giferemivetamugavezomaw.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/28860903029.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/76952469144.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/72184923430.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/61337682823.pdfIn PDF document text
    • http://gysanya.com/upload/file/210915223503612674jg3bnkimxwi2.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/72416257815.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_off0000dcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 17476 bytes
SHA-256: 4fb62575b9cd332f3c7536b2e7905608fb2d449abbd3e93983fee13629108d35
font_02_sfnt_off0001226d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226D 10744 bytes
SHA-256: 8c1a453d0ccbc67d4b8915c21eda525f452107abe8aceab532d967766000b6ca