Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e27a449aa46c165…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 19:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0976bffb2eeaaab7f1632fd6821bbc08 SHA-1: ce293cfb0299d880afe500c2477b53b20944fb9c SHA-256: 6e27a449aa46c1653790e1f55badc36579d7aa003efa93b034fce34acce3b9fa
166 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document is designed to trick users into downloading a password-protected archive, a common tactic for evading gateway security. The embedded URLs point to various PDF files, likely serving as the lure or part of a link farm.

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 http://ruresept.ru/files/file/bilavedutokepukude.pdf In PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/kafeso.pdfIn PDF document text
    • https://linardi.ru/files/file/kerunopidesomow.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/liwofovaludu.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/f6pc38d6oh6r4l5u04vb04qu15/23907697495.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/bevab.pdfIn PDF document text
    • http://ciskmv.com/css/file/gibasapojopomaz.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/11527816652.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-8-30/20210830020102809374.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/4960204310.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/wogugafilixolaba.pdfIn PDF document text
    • http://deltools.com/userfiles/file/bezisunubutanepuginidadul.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/bapizimigatewajam.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/zawuj.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/46599621504.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210621154650_plecf3.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607025542a7a9---sixodojavenaluv.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/49826311968.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210804015041.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/zeraxu.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/fixiligosurizetebimos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=tutorial+base+de+datos+sql+pdfPDF 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_off0000d1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FA 10736 bytes
SHA-256: 35db73a8692c7c4a06cebc525fbb27cdadfb6254062218bd03fa2c1f7e1b217c
font_01_sfnt_off0000ea4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 17132 bytes
SHA-256: d7a52f3e2dcb0f2588644d00585753cfe519b66496f5e24265a49cfa583a3ece
font_02_sfnt_off000116a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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