Malicious PDF — malware analysis report

Static analysis result for SHA-256 d316c63f42e7dff4…

MALICIOUS

PDF

79.3 KB Created: 2021-05-04 07:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4235e940cfdbdf79647bdb1b52ccb615 SHA-1: b6d21d7de369c1d81fd117901dfff10866e2115d SHA-256: d316c63f42e7dff4374847389a88e3a1f94a1426fc311eccc59c552914577fa5
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a ClickFix social engineering attack. The document likely attempts to lure the user into executing a command, as indicated by the 'SE_CLICKFIX' heuristic, which is a common method for bypassing macro restrictions to download and execute further payloads. The presence of numerous embedded URLs suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/strik?utm_term=how+to+use+ms+paint+in+computer
    • https://cdn.sqhk.co/xurinuwame/hjgdiFh/vewepexovomo.pdf
    • https://cdn-cms.f-static.net/uploads/4454822/normal_60135d020117d.pdf
    • https://cdn.sqhk.co/kosaboze/YQjhghh/latoganejob.pdf
    • https://cdn.sqhk.co/dosojegomugu/Jih4FaK/88879820105.pdf
    • https://cdn-cms.f-static.net/uploads/4426267/normal_6033ec8124bdf.pdf
    • https://static.s123-cdn-static.com/uploads/4371800/normal_5ff1dba910243.pdf
    • https://cdn.sqhk.co/vekudaselux/hgiaRdj/battlefield_bad_company_2_apk_rexdl.pdf
    • https://cdn.sqhk.co/nuduniguwufo/vb0ihc4/47140302509.pdf
    • https://cdn-cms.f-static.net/uploads/4425229/normal_601502cae8ab9.pdf
    • https://cdn.sqhk.co/gidetixi/agfihib/23869748871.pdf
    • https://static.s123-cdn-static.com/uploads/4502439/normal_5ffc15d7363c3.pdf
    • https://static.s123-cdn-static.com/uploads/4405945/normal_6000af5fac25c.pdf
    • http://newberginvestmentproperty.com/foxamigibubazokywzi.pdf
    • http://avtoshkola-region26.ru/did_thrawn_know_palpatine_was_a_sithrcynp.pdf
    • http://samozanyat.info/android_adf._ly_bypass5akfs.pdf
    • https://cdn.sqhk.co/remigalakefo/iyahcjd/pezoratubosofi.pdf
    • https://static.s123-cdn-static.com/uploads/4457876/normal_5fcf0d0387fd7.pdf
    • https://cdn.sqhk.co/jesuzedavoti/fjahajd/pazejatiforokokub.pdf
    • http://bitcoinlearningcentre.online/star_citizen_downloadvo6et.pdf
    • https://cdn-cms.f-static.net/uploads/4479445/normal_60184d96bef01.pdf
    • https://cdn.sqhk.co/samekikogeri/jgiEJBa/roguelike_rpg_offline_order_of_fate_mod_apk.pdf
    • http://bestrongbyg.com/skype_launcher_7._40u8wpj.pdf
    • https://cdn-cms.f-static.net/uploads/4485457/normal_6051135a1fce9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xarojapi/in-_house_counsel_compensation_report.pdf
    • https://s3.amazonaws.com/rogugagatuf/xiravonuxinevidariroke.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e910.bin
1a77e724981ea8d580e26fe5952d4ef1cbe7df9715a952b65a2b917162fd3bdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 4984 bytes
font_01_sfnt_off0000f9f4.bin
b69cf5f53c5eec7011587005726279465a43d76bf468dba3c8537207f3901fff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 12256 bytes
font_02_sfnt_off000120e0.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120E0 4324 bytes

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