Malicious PDF — malware analysis report

Static analysis result for SHA-256 2762f347d68080d9…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 23:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9784f079f62a58d5865f57cc60afe6f3 SHA-1: 072f2338620296b7ba27b066b9a0a89f4fc102a7 SHA-256: 2762f347d68080d9b6e03a462beb71591b91353cdf154c02d47a67a46a3fea80
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into downloading an encrypted payload, likely to evade security scanning. The numerous embedded URLs, many pointing to disposable domains, further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://es21sys.com/userfiles/file/mozadonefetedodisedixa.pdf In PDF document text
    • http://thetestmag.com/userfiles/files/semaduporabere.pdfIn PDF document text
    • http://195exim.com/datas/files/8691204091.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/rexirunuzozojesijokimage.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/55256868949.pdfIn PDF document text
    • http://viorina-deko.com/images/file/soranevujupeb.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/bixanakotamuvali.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/xivuzovodesubatufi.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/59324912181.pdfIn PDF document text
    • http://swhos.com/upload/files/72996020473.pdfIn PDF document text
    • https://purefeeling8.com/data/file/rurezoserojawifadidi.pdfIn PDF document text
    • https://rm-parketi.si/uploads/73181121483.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/3589881035.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/vikixilivok.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/12345224702.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/2571696315.pdfIn PDF document text
    • https://rcot.org/userfiles/file/30747496674.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/busaguxusenag.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1df2c346b---biridi.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/tigamotoxusebopoto.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/ranojar.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/fesopupobas.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/mujopanoxodezifi.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/89612863366.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/favuxuroxurazesexubari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=wwe+2k20+iso+file+for+ppssppPDF 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_off0000d855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 10400 bytes
SHA-256: ce147e27ecc2f9b301875a9dfd478a15ef7f13645affb0cd272d55e152453d11
font_01_sfnt_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 17112 bytes
SHA-256: 01391638e316e7f055a94dc9e64b304e0487eb425094f93ac026f87ec45f1897
font_02_sfnt_off00011c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1