Malicious PDF — malware analysis report

Static analysis result for SHA-256 682a48270d88db13…

MALICIOUS

PDF

76.5 KB Created: 2021-03-22 17:42:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c6d91685c8365ead7e8181b80ec5d07 SHA-1: b281f7eb28e42179e5d89ef6d7f995f0aea0104d SHA-256: 682a48270d88db13894d4b2cb6f46dd57de8a2a41545f06f2dee4db7084205c1
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wix?keyword=first+touch+soccer+2015+apkpure
    • http://kulupitodawiri.iblogger.org/jafowera.pdf
    • http://kizunawinim.getenjoyment.net/canara_bank_neft_form.pdf
    • http://geekcods.com/gigizuxadetukamexepaxezen9yic2.pdf
    • http://m-laskin.ru/vurawe20qfs.pdf
    • http://helplnstagramcontact6088758.com/nufemugagisuxizjobv.pdf
    • http://clientbluebadge.com/what_if_new_marvel_movie3ar3r.pdf
    • http://xizunamorazoved.iblogger.org/57180207546.pdf
    • http://dayzcommunity.info/what_are_the_disadvantages_of_database_systemsge0px.pdf
    • http://midakurapujif.mypressonline.com/national_geographic_magazine_october_2020.pdf
    • http://niwizonoleror.mywebcommunity.org/does_health_insurance_cover_maternity.pdf
    • http://sozaxesugoj.mywebcommunity.org/streamline_english_connections_workbook.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_e69f8e0723a7453fbd4d2eeeed9902ee.pdf?index=true
    • https://37459de8-d961-4a2a-897a-801dad55dcfc.filesusr.com/ugd/1395e2_0eedb576046f482eac68b27934703c94.pdf?index=true
    • http://pezusor.epizy.com/16924861595.pdf
    • http://lonivone.rf.gd/71257672937.pdf
    • https://b66a6cc6-7028-4fd7-9d19-084b2b27c535.filesusr.com/ugd/4015cf_745acfc531414a84ae21fb0b5e29d941.pdf?index=true
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_ddb3e2108cf04a43a2c22f3fe9782a05.pdf?index=true
    • http://wukosow.epizy.com/lilolatizazixafemefuwogi.pdf
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_55addce8090746c580b1d337f754a04a.pdf?index=true
    • http://fidalanono.myartsonline.com/wageko.pdf
    • http://nabenejajoko.myartsonline.com/past_continuous_tense_worksheets_for_grade_3.pdf
    • http://vobikeretuwof.atwebpages.com/chemistry_apparatus_list.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_off0000e9f9.bin
c665daf1837aa1b383abdc7b954ab4c4ce775750b2de7c227a90777cf04d0d5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F9 5456 bytes
font_01_sfnt_off0000fc91.bin
9d589854f45190e8b493b5d465436f1d94edc893598eb831704a3822cc35701a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 12676 bytes

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