Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed216e658d5fd20…

MALICIOUS

PDF

77.9 KB Created: 2021-04-11 00:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32567f47e3b9b9d13ed1a63e4175c249 SHA-1: 2bebd845061f2197330b101d619968a33b6d8ee4 SHA-256: aed216e658d5fd207c49b713093aaa0d10304f2071c6217aa9cd2d2424f6c738
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a 'PDF link farm' designed to host a large number of PDFs. The document body, though heavily obfuscated, contains text related to 'Sullair compressor fault codes p2', suggesting a lure to attract users searching for technical information. The presence of multiple unknown reputation URLs further supports the malicious intent, likely to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=sullair+compressor+fault+codes+p2
    • http://sfhgfje5df.xyz/les_miserables_broadway_streaminghdr33.pdf
    • http://good-production11.site/9743566881bv8bk.pdf
    • http://fomamiforepu.22web.org/beetle_care_sheet_uk.pdf
    • https://cdn.sqhk.co/baxotonad/cQVjcjb/93745277330.pdf
    • https://cdn.sqhk.co/mixaluwekitu/ijjaa00/transparent_live_wallpaper_app.pdf
    • http://shortsomfj.space/wakuluve0yh4j.pdf
    • https://fimiximokizo.weebly.com/uploads/1/3/1/3/131384127/lorinekibolowu.pdf
    • https://kuvugelovusilu.weebly.com/uploads/1/3/4/4/134437140/9079907.pdf
    • https://cdn.sqhk.co/xurinuwame/bbhheuO/fiximipiz.pdf
    • https://cdn.sqhk.co/varugefezum/TzIsgjk/99622641949.pdf
    • https://cdn.sqhk.co/livaxipovage/egijehi/zejavesojomiga.pdf
    • https://cdn.sqhk.co/vegubefeno/Aidoid8/vofon.pdf
    • http://stopnutristrike.ru/acute_infectious_mononucleosis_icd_1018a4p.pdf
    • http://vofovadero.22web.org/mipoxajejukakiw.pdf
    • https://lakiregatu.weebly.com/uploads/1/3/4/5/134589313/2987102.pdf
    • https://cdn.sqhk.co/tezizejaropu/bBfsRhe/best_mazesoba_menu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gerosopidazab.rf.gd/hungry_shark_old_version_mod_apk.pdf
    • https://s3.amazonaws.com/tokudapele/job_offer_rejection_email_template.pdf
    • http://jurolabadujo.rf.gd/35960415250.pdf
    • https://s3.amazonaws.com/redegelesibif/what_type_of_crime_is_inchoate.pdf
    • http://zukusuvajijip.epizy.com/cash_budget_financial_management.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_off0000f185.bin
ca1b0e49fd868ba4839511dbc0c82c99ee24d09a5369c123acaf26646017b1af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 5536 bytes
font_01_sfnt_off00010448.bin
2dbe6efe76068b6b8a00331da0be2f0bad97881434f876ee59e67b4b9f5c9b46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 11200 bytes

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