Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4762a37b1f061e2…

MALICIOUS

PDF

80.2 KB Created: 2021-09-21 00:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e0b6367225d60e363dbe003b5295777c SHA-1: 0826d8fed743724df2e79d98570bfbc627532210 SHA-256: d4762a37b1f061e20fcff01b75da3df44c8f4d45a5b97bd599832cab2d9b0860
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://huntic.ru/uplcv?utm_term=top+5+best+photo+editing+apps+for+android PDF link annotation
    • https://volgogradexpo.ru/ckfinder/userfiles/files/72094522481.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/wojefepuvekapopipinoba.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/44062726223.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/lodoke.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/12078733050.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/sakuzirozisimosojomumezi.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e516474a4---dujunozipikixusew.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/lamunerunomomonekaviwus.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/40866315936.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/bupizupapugitogadozukig.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/65210247557.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/vugokava.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/8516209549.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/32864224404.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/fusitaxukelepe.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/82760324968.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/rigelomiboximamuvirefeg.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/19222561913.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/53690338435.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36028263456.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/vetujev.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/74474734288.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/18725625397.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/bexemazimesiw.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/57056420310.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/zuluxexidoxebapevenolax.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_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 16628 bytes
SHA-256: ab184d52b3f48e24b09afd6f9bb577665099d396c9fc92e6535abf7a1f43d956
font_01_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 10968 bytes
SHA-256: 49ac3d1cfdc98acdff8ea83532bacd92b362dcb39c888a2b17b6ccbc79d317da
font_02_sfnt_off00011aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1