Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6f3faff8f770f8…

MALICIOUS

PDF

76.2 KB Created: 2021-09-12 15:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 699dfc54b9bec53d8508a0c1f94709f6 SHA-1: 0069370fd2b201a090b05f8c10f83b4dd5ebd831 SHA-256: 0a6f3faff8f770f87833ffbc30f77213f57fb35f5568f6ae32904472bd3e68df
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to PDF files on various domains, suggests a link farm or redirection mechanism designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bargiel.com.pl/ckfinder/userfiles/files/sobajamuvipikivalagi.pdf In PDF document text
    • https://batikatravels.com/userfiles/file/141009333.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/muketowulup.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/99808255806.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/jugudenavalopanikarogolan.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/41255686884.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/galovuriwijanono.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/28456131994.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/soresovirubowijonuwu.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/gaxubelatadekeboresaruxu.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/83020125652.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/boxazanoketizonowax.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/dojuzuwawurobumedovimovu.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/gebewiwovujopuxu.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/jifivoweputu.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/tusunefiwok.pdfIn PDF document text
    • http://lizhechem.com/upload/files/62954498601.pdfIn PDF document text
    • http://askaudit.ru/price/kizisozosatikek.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/33063291846.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/putotoxazegevere.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/fobibalejifijeralu.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/88801565524.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/49721591618.pdfIn PDF document text
    • http://maihome.hu/admin1/file/13363173469.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/62437763611.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/70053207537.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/bowobezedigoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=watch+shrek+3+123moviesPDF 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_off0000c2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF5 10840 bytes
SHA-256: e0d51847e9e78346a8d0d0c2df17fe924dd679f9aa6bbd2fd4f3b93cc7666f2e
font_02_sfnt_off0000f43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 17908 bytes
SHA-256: d0c0d60b3cbf009e85148c828035e8326ff84af747bd2154b87740224f20c344