Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a9e2d6fcf9fcf8…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 20:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df9b39ab3d79738e6ae36fb8a84eef41 SHA-1: 33937bfb398d4948ce9b87dccd934394ef452c68 SHA-256: 61a9e2d6fcf9fcf81caa25f4db8a2580de39bd15c199729768af1f14ce1f38fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, containing numerous links to external domains, many of which are hosted on disposable domains. The embedded URLs suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution. No scripts were extracted from this sample.

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://weddingitaly.jp/images/file/xexinomesasabuwino.pdf In PDF document text
    • https://jphotographyllc.com/userfiles/file/85147061286.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342975c5b8c---85430271007.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/12784624729.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/moragigafaruwibipadomi.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/jixuwato.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/33201541396.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/91062082092.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613413635ff14---11718576451.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/xodixogajetimejidivegine.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/durifelidavanuretanur.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/gesatewegurifetawuf.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/gudomuset.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/86389236845.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210905094250.pdfIn PDF document text
    • https://ckmandarin.com/uploads/ruxemoxujitekedipoj.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/vovemepopetudupafut.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/wovimelegaz.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/zutomuzuzigobelofovi.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/37826912395.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/1597578589.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/vebivonojaxirofanuwilup.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/tenedapibo.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/86113179566.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/bikatavebexuvozes.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/kuvupakipanalafosuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=windows+7+repair+disk+isoPDF 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_off0000d484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD484 10460 bytes
SHA-256: c5723da5ab9120c8dad5e336529361f8c96b19c95c2a4564fbce67c8e9d578cd
font_01_sfnt_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001048c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048C 17404 bytes
SHA-256: 112b8ec87b8219a8ebab0fad87b80a2d865cce02c2c84e88815df6932dc47e41