Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e65b9d6ed547d5…

MALICIOUS

PDF

68.7 KB Created: 2021-10-03 05:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e183184c281864a10b6b5a01a23854f2 SHA-1: 9a16156106c332d194347f86f1f1bee075798acb SHA-256: c3e65b9d6ed547d54b262801108579c43fda058c5309156e5a5ceb78f7591f86
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript and multiple external links, including one to an algorithmically-generated URL. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and external links suggest the PDF is designed to exploit vulnerabilities or redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://ahreco.com/uploads/news_file/lapumatevukoxitiga.pdf In PDF document text
    • http://hexindechem.com/upload/files/89107324872.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/gukakotofikoboda.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/runulifebulaxizono.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/9969938661.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/79929055707.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4687585311.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/91957214946.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/xurabenalogejaf.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/91119471540.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/53995274121.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/2195253848.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/badewo.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/22159598999.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/1n85pe5kou270950le4e82kcj1/liratezaful.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/lafuf.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/vigaluviwenisulonorova.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/50281141612.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/xolisutubezini.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/liwuvipakuvamezonoja.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/92265273835.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/tuboredizigalog.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/12247035157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=abandoned+and+confiscated+vehicle+auctionPDF 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_off0000ade5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE5 10760 bytes
SHA-256: 2dce08fe01e190787d39f91fc958d2a7c3673256fe0dc431ee04cf7c55f06ca7
font_01_sfnt_off0000c6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000deb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB6 14704 bytes
SHA-256: 296597958ad7cc646f60cd261e93ac2b6d14acb129bb2e6d9a5147cabde14911