Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2538386a84490da…

MALICIOUS

PDF

73.9 KB Created: 2021-02-26 10:39:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8264987f191716c8d876b8bf2b7cb292 SHA-1: b54124ab4ea69de49e62d083cb9aa3396592531a SHA-256: e2538386a84490daa1eaa82af49a527f882fbf516ab992cccc9338ad773d381b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm. The document body, though heavily obfuscated, appears to contain keywords related to electrical symbols, likely as a lure to encourage clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://nipisod.ru/123?utm_term=electrical+symbol+for+outlet
    • http://jepenufi.getenjoyment.net/98857473301.pdf
    • http://fezivexem.iblogger.org/me_tera_amplifier_hd_video_song.pdf
    • https://static.s123-cdn-static.com/uploads/4474739/normal_60094bce7f055.pdf
    • http://raxejudesezix.scienceontheweb.net/geruweli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jasunusemoki.onlinewebshop.net/pitalokenufidimisajo.pdf
    • http://xovijoj.epizy.com/nafejoxulawuk.pdf
    • http://fusarafabar.epizy.com/airtel_tv_premium_apk.pdf
    • http://kedisijusa.onlinewebshop.net/zosiwonovev.pdf
    • http://matiwusaned.rf.gd/zepapororedidikaro.pdf
    • http://zawagebojirowe.rf.gd/adura_mi_ti_gba.pdf
    • http://dubaduvuk.rf.gd/52130360707.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e555.bin
c6c00a464d6eed4be99a6e5cd39988d9443f821e059e44c7b2dfd78242603f8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 5224 bytes
font_01_sfnt_off0000f711.bin
f79190d9737c9e620ddcb1633b6f1f1b69c5511ceda1567973e50f50848c50c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 10576 bytes

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