Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51ea2bb1602030c…

MALICIOUS

PDF

119.1 KB Created: 2021-03-24 03:10:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0088a703325b2ceda54421d16a98262f SHA-1: 4092c0ec24dc1e51b36a84eec467ac86d47f881b SHA-256: f51ea2bb1602030c0818fc98dc3fbe08154238decb0e8b59f3e79c8b8d461831
104 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains an embedded URL that likely serves as a lure for users to download a malicious payload, disguised as a bulletin. The presence of external URIs and embedded URLs suggests an attempt to redirect the user to a malicious site or download further malware.

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/award?keyword=psc+bulletin+pdf+august+2020
    • http://yblda.fun/what_about_you_reply_answerf4qmo.pdf
    • https://cdn-cms.f-static.net/uploads/4463812/normal_600bc6f23aa7a.pdf
    • https://static.s123-cdn-static.com/uploads/4481271/normal_5fe234637836e.pdf
    • https://cdn-cms.f-static.net/uploads/4369901/normal_6011c3da2cf79.pdf
    • https://cdn-cms.f-static.net/uploads/4471686/normal_603b8fafcc333.pdf
    • http://tricitysikhs.com/how_to_calculate_the_mean_and_median_from_a_frequency_tablem4o5d.pdf
    • https://cdn-cms.f-static.net/uploads/4408595/normal_604e4401183ba.pdf
    • http://momuloteseze.22web.org/the_story_of_our_lady_of_guadalupe_and_juan_diego.pdf
    • http://blancer.xyz/gifetazaradixa5na.pdf
    • http://thehensleys.org/lobby_hero_bill_monologueikr8n.pdf
    • http://salonlabs.xyz/vomixekuvowijuxuwijyy27.pdf
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102Hussain
    • http://smc.org.inhttp://smc.org.in
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pirosisob/non_destructive_testing_jobs_in_hyderabad.pdf
    • https://s3.amazonaws.com/pirosisob/rudebogeb.pdf
    • https://s3.amazonaws.com/xubifupi/32360925847.pdf
    • https://s3.amazonaws.com/gavapozalilup/pifizifigurakelilolirera.pdf
    • https://s3.amazonaws.com/nisoxow/21450186449.pdf
    • https://s3.amazonaws.com/liwafo/tyt_th-9800_modulation.pdf
    • http://fojamemu.epizy.com/mapasupadetujafer.pdf
    • https://s3.amazonaws.com/zesixefe/pack_n_play_mattress_cover.pdf
    • https://s3.amazonaws.com/xukanomarexumu/osrs_cannonball_making_guide.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/
    • https://gitlab.com/smc/meera/blob/master/COPYING
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00016770.bin
e36bbebcccd22d3a3a0a801bb11273bc92503f3f630562e1639ca6b2ea88f65b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16770 22276 bytes
font_00_sfnt_off00015431.bin
e07985ff1b109e5ba77cf8ddb756710b2f40061511bc0610e24813af51a1e292		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15431 5640 bytes
font_02_sfnt_off0001a9d6.bin
b5c0bf8f0eae4e67207f563c8b257640ef3997f9ce169fd7bc79e585624079f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9D6 10804 bytes

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