Malicious PDF — malware analysis report

Static analysis result for SHA-256 4614736ec15080d7…

MALICIOUS

PDF

79.6 KB Created: 2021-04-17 22:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 610bcae78f5816da1a307504309f7560 SHA-1: 50a4cdb83177a95506602579cdac6abd24c5f3ba SHA-256: 4614736ec15080d7972c1d61e623f85ffe1ecd3e25f3e32d66ed0ac4acd4df16
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 link farms. The primary URL, 'https://nipisod.ru/strik?utm_term=how+to+relieve+a+cystic+pimple', is presented as a lure related to a common health concern. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/strik?utm_term=how+to+relieve+a+cystic+pimple
    • http://deutschebank-meine.com/resumen_del_libro_el_juego_de_la_vida_y_como_jugarlo1fvfb.pdf
    • http://sigisuzuk.getenjoyment.net/46081385743.pdf
    • http://fikakutipid.mygamesonline.org/fugefidobaloto.pdf
    • http://givimemaregudum.sportsontheweb.net/arturia_matrixbrute_manual.pdf
    • http://gedawuxofawu.iblogger.org/zusekoxinadofof.pdf
    • http://legendnat.space/carmina_burana_percussion_scorex5kf4.pdf
    • http://xojuxelase.medianewsonline.com/52976295418.pdf
    • http://procripton.com/fascial_stretch_therapy_downloads3z8w.pdf
    • http://itverys.space/bloom_and_lahey_modelalvl5.pdf
    • http://werikipirojenob.scienceontheweb.net/what_are_the_core_values_of_education_for_society.pdf
    • http://xuroriwonufuz.scienceontheweb.net/gurizubozujikis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xunudijumo.myartsonline.com/tosurawikuwuliwimap.pdf
    • https://uploads.strikinglycdn.com/files/cc8f43ca-b71b-4bff-8608-389178a9a5f2/gawikoputepazavurafatare.pdf
    • https://s3.amazonaws.com/lakadutof/what_are_some_ethical_issues_in_research.pdf
    • https://uploads.strikinglycdn.com/files/e62af325-2317-4b91-a2b0-573a19d444c6/nagumelikuzatugepaviwide.pdf
    • https://s3.amazonaws.com/dobesogum/kifif.pdf
    • https://uploads.strikinglycdn.com/files/2d07bdc2-470a-4cd5-b13e-b799f16fb171/learn_english_speaking_conversation_between_friends.pdf
    • https://uploads.strikinglycdn.com/files/4d913ca4-816e-4b43-82d2-73bbd3663753/43357257673.pdf
    • https://s3.amazonaws.com/jeromisixinolib/fukobibufojiwanugokenuma.pdf
    • http://wujamomototugo.epizy.com/kosotuvanokare.pdf
    • https://uploads.strikinglycdn.com/files/fa95d1a1-816f-47a6-a136-6045d85015b2/how_to_build_kallax_drawers.pdf
    • https://s3.amazonaws.com/xunilukegez/gebikowubutila.pdf
    • https://s3.amazonaws.com/selivuvumepaveb/65351790316.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_off0000f8bf.bin
a08b6f91eb5ccb847e35402ff11a0450d8a78fbf63c20da0f06e240dab05ab3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 5296 bytes
font_01_sfnt_off00010ac5.bin
bd2ba08a23c805efec58c29d4bc6a73703bd8dc59cdee658b94ffd54fbf9acae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC5 10660 bytes

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