Malicious PDF — malware analysis report

Static analysis result for SHA-256 86da80f4df1bf28e…

MALICIOUS

PDF

79.5 KB Created: 2021-03-22 07:03:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec25f4e3ea8be6665fcffd58caf3ce55 SHA-1: ded1aee880fa0aacc001cb47809ffb4bcbdd60d3 SHA-256: 86da80f4df1bf28e6c75ad59c2b1a8e40e7ac818edb5a7d035e8dba169dcaa3a
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a URL that appears to be a lure for academic reading passages, likely intended to trick users into downloading further malicious content. The presence of embedded URLs and the nature of the detection suggest a phishing or credential harvesting attempt.

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://zajinet.ru/award?keyword=reading+passages+for+ielts+academic+pdf
    • http://aicberg.net/35978802394gdw08.pdf
    • http://kmikaerfs.ru/good_workout_for_chest_arms_and_absobp8j.pdf
    • http://tivaxamikesu.iblogger.org/apsa_80_brochure_in_english.pdf
    • http://vas-rem.ru/instagram_online_video_er_app78sub.pdf
    • http://autolombardpro.ru/refetegokutilekam8z60.pdf
    • http://fidafevemikiwe.mywebcommunity.org/vagijenewafevodepejito.pdf
    • http://kumokopilomeme.22web.org/is_newsmax_on_tvision.pdf
    • http://italia-doc.space/zowexusurufimumamikelamogebpm.pdf
    • http://alphabitx.com/sesapunonazotadine638ra.pdf
    • http://gemofesane.medianewsonline.com/vicks_cool_mist_humidifier_walgreens.pdf
    • http://zuraleres.mywebcommunity.org/wevegis.pdf
    • http://doorstepcomputers.com/51530374935v184b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bb0106b8-f3e0-414b-a873-a0e24df3f2ad.filesusr.com/ugd/b84a33_5badf876d6ea49fca7b34b802adb6f88.pdf?index=true
    • http://pimudovi.epizy.com/bise_sukkur_board_result_sheet_2018.pdf
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_c1663bd6df6d4cb4baa9fc81f36f7661.pdf?index=true
    • http://wufagezigedo.onlinewebshop.net/xotaf.pdf
    • http://zepotusetazokor.rf.gd/mass_effect_andromeda_guide_franais.pdf
    • http://rosuronuvure.epizy.com/frontal_1mg_bula.pdf
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_fcc345a85dff4a8ba5446df48834d627.pdf?index=true
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_96990285d0f8409b9f3b1c15bae75081.pdf?index=true
    • 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_off0000f85d.bin
a1099ce415e3e06fcdd90a43531982454d5cb61ab314847ffa0e290eed07c682		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 5484 bytes
font_01_sfnt_off00010af8.bin
f7794004c3798bf8f603f22fc3daf7e49d22c0713b62d7b15c27875426cdd22b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF8 11088 bytes

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