Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1f1088ea633018…

MALICIOUS

PDF

79.6 KB Created: 2021-04-02 00:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05e1aa3cf96ba0d9ab2608611544e7bd SHA-1: b2f5f5814185b99f1a13eb97535b822103bfb7b9 SHA-256: aa1f1088ea633018fb63af1c82c894aeab30c6a868df1271d211dfe08d624091
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that is likely used to host a malicious payload or redirect to a phishing page. The document body, though heavily obfuscated, appears to be a lure related to educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=problemas+de+porcentajes+faciles+de+primaria
    • http://youla-24.cc/bolos_formatos_variados14tbn.pdf
    • http://zelopaqq.xyz/jitifozimrf42.pdf
    • http://openchambre.xyz/jejaziyhq6u.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zuses/azur_lane_lecture_hall_guide.pdf
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_8afc27ab0d334985848974b0cd1be2b7.pdf?index=true
    • http://bolarerovu.epizy.com/belakapasimoxafusabasiro.pdf
    • http://gelonixaj.rf.gd/the_taming_ofthe_shrew_act_2_scene_1.pdf
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_8d58889b9f3a406799b1b8424b33e2b7.pdf?index=true
    • http://regozuluxawig.rf.gd/winigusiletotiwiziva.pdf
    • http://zonizuziguzapi.rf.gd/89967860482.pdf
    • http://lupugavediroz.rf.gd/ruboxulusajotasurarerisev.pdf
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_320cdd550c894268867b8c3f5731b881.pdf?index=true
    • http://modeludetilopo.rf.gd/17582184723.pdf
    • http://pakatikik.epizy.com/s9_navigation_bar_apk_pro.pdf
    • http://nerigob.epizy.com/inventory_sales_report_format.pdf
    • https://s3.amazonaws.com/nonabafat/2009_civic_reset_maintenance_light.pdf
    • http://kesuzidadubitik.rf.gd/79537282466.pdf
    • https://s3.amazonaws.com/novipaliwid/figemo.pdf
    • https://s3.amazonaws.com/bezutu/the_measure_of_a_man_bible_verse.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_off0000f466.bin
44816acd998534eacb79679708a7b0e8bc377d297ab7235eb034a99f73c79d86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 5516 bytes
font_01_sfnt_off0001070b.bin
a3f60a456ca2e732f93039d4b0d531117ed66c6855b57dc7a3d60b0ae057cb37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1070B 12312 bytes

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