Malicious PDF — malware analysis report

Static analysis result for SHA-256 81393c1c21dfd90b…

MALICIOUS

PDF

92.3 KB Created: 2021-05-12 10:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdc50ea58bfff1494275a155be86bf0d SHA-1: db9a5162852417873e03b260d5d1d502f6e0d3e1 SHA-256: 81393c1c21dfd90be53045927a90d39d39ecfddf98cdf517e3e3738b8bf65b06
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI that redirects to a URL associated with phishing, likely intended to lure users into a scam. The document body contains garbled text, suggesting it's not meant for human consumption but rather to exploit PDF vulnerabilities or obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=acer+aspire+one+cloudbook+11+specs
    • https://static.s123-cdn-static.com/uploads/4366366/normal_5fc65c14920e1.pdf
    • https://cdn.sqhk.co/fegukajebaj/fKF7oT1/97691523317.pdf
    • https://cdn.sqhk.co/mewixamok/i6hcxGK/puvak.pdf
    • https://cdn.sqhk.co/zebenane/hjgshac/natural_beauty_remedies_for_face.pdf
    • https://cdn.sqhk.co/kixagixupo/dfih8VA/76722088130.pdf
    • https://cdn.sqhk.co/videgogaf/OtgYhgr/aquarium_fish_tank_decorations.pdf
    • http://optamorem.com/dungeons_of_dredmor_builds_magey8lj5.pdf
    • http://naturalik.fun/17700098176nmo3b.pdf
    • https://cdn.sqhk.co/detaludolef/i2uhdie/poliliwovexasixukom.pdf
    • https://cdn.sqhk.co/vumuwuxa/a25JaU4/civilization_third_expansion.pdf
    • https://static.s123-cdn-static.com/uploads/4382953/normal_5ffaf06a89a7e.pdf
    • https://cdn.sqhk.co/gajerivab/796high/dopivufenif.pdf
    • http://instapresent.site/315829868727zolk.pdf
    • https://cdn.sqhk.co/zujubokave/FiiDXhh/caption_for_instagram_and_facebook_photos_apk.pdf
    • http://sokelekife.iblogger.org/list_of_useful_french_phrases_for_gcse_writing.pdf
    • https://cdn.sqhk.co/jarutejip/JicDifD/flipper_anderson_giants_game.pdf
    • https://cdn.sqhk.co/wefekoferu/i9GhffA/laundry_care_label_symbols.pdf
    • https://cdn-cms.f-static.net/uploads/4391903/normal_605968a08a4de.pdf
    • https://cdn.sqhk.co/riwewazisara/gFU8ggy/49485949426.pdf
    • http://trafikcezaodebayisi.com/joey_pigza_swallowed_the_key_freenynvf.pdf
    • http://ketadiets.site/81205691843n2li9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rawuwad.epizy.com/agitated_nutsche_filter_dryer.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_off00012a42.bin
b2f88165fcb6285dec8f66956985a89dde26674c11f2ff9cce65c3ebda67a79c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A42 5312 bytes
font_01_sfnt_off00013c61.bin
1776a0cfbfb5825cc8c53d7c044ca85588a5604f9e3228110547a89e62e47d47
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C61 11572 bytes