Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3aa9815902752fe…

MALICIOUS

PDF

77.9 KB Created: 2021-02-18 01:40:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84175132f968be5fd7ecb502f41ef410 SHA-1: 7b4af96e696109960f61b626815b390ed87da71a SHA-256: a3aa9815902752fe102f76f69783f33d27e8bad11d88ed685be7278c6c704dd1
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain. Heuristic analysis and ML classification strongly indicate malicious intent, with ClamAV identifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to educational material, directing the user to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=agudas+llanas+y+esdrujulas+4+primaria
    • https://cdn.sqhk.co/ramazunor/aUifgjd/29873332936.pdf
    • https://cdn.sqhk.co/walamalesumi/jaLhgdm/tipag.pdf
    • https://cdn.sqhk.co/letinumi/y6gghYs/dodovajopubavomug.pdf
    • https://cdn.sqhk.co/waxipefimafa/zak8Vgf/vixulusuro.pdf
    • https://cdn.sqhk.co/baxalelizop/jdjbojS/nerexularabevikatiwuge.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gurafoga/needle_stick_injury_reporting_form_cdc.pdf
    • https://s3.amazonaws.com/mujesogi/tatiana_manaois_like_you_video_mp4.pdf
    • https://s3.amazonaws.com/tasufagijaremo/41085617018.pdf
    • http://zubixuguse.epizy.com/kingfisher_bird_information.pdf
    • https://s3.amazonaws.com/rekorewexidiwo/94483605899.pdf
    • https://s3.amazonaws.com/vabemavuputenif/12758484981.pdf
    • https://s3.amazonaws.com/tonemakopinibem/arjun_reddy_film_with_english_subtitles.pdf
    • https://s3.amazonaws.com/davolazupivowi/72668613873.pdf
    • https://s3.amazonaws.com/debamijizozexo/15309002694.pdf
    • https://s3.amazonaws.com/nelizenejakarug/19283995974.pdf
    • http://jitimixilu.epizy.com/converse_plataforma_altas_blancas_piel.pdf
    • http://xutasiwewuzaf.rf.gd/11064988212.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_off0000f2bb.bin
cfa8d335072fae816c571b1eee295ad47244742ac7dc968c7d6415a772b0b215		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 5532 bytes
font_01_sfnt_off00010597.bin
d6335c0f6cbc6d8ea2a9f2d505c7d5b83127f2d726b80e6fd9a69438e4f12230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10597 11200 bytes

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