Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1458f326690e71…

MALICIOUS

PDF

78.6 KB Created: 2021-03-20 14:15:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bc628de950f33754fb19d19d0ba32b4b SHA-1: 2b9260e2ed0259c7e47145cb7d43a070dbdf55b2 SHA-256: cd1458f326690e7193605e07e355fb5d382c63b5820e87949f52766c9a0042a5
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically masquerading as a DWG viewer download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of numerous links and disposable hosting suggests a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/strik?utm_term=what+is+the+roman+number+of+5002 PDF link annotation
    • https://cdn.sqhk.co/zevijevam/pgiDRJP/dwg_viewer_64_bit_free.pdfIn PDF document text
    • http://xonejalevesezom.sportsontheweb.net/jitugufivufivomi.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxovowupofa/kiezlge/assassin_s_creed_syndicate_outfit_schematics.pdfIn PDF document text
    • https://kusijavi.weebly.com/uploads/1/3/4/3/134385668/437810.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/gasomisulafabojuriv.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/hdibWNV/find_the_button_flash_game.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/a_storm_of_swords_chapter_51.pdfIn PDF document text
    • http://xijewaka.22web.org/jikame.pdfIn PDF document text
    • https://pesiwuveso.weebly.com/uploads/1/3/5/3/135392822/59d8eb6bf7bb5c.pdfIn PDF document text
    • http://aycotoro6.xyz/home_design_3d_apk_unlockedp52iq.pdfIn PDF document text
    • http://myyshooop224.site/zolemonojipovuwolidajiqhrcj.pdfIn PDF document text
    • http://tuimag.ru/98165561111ravmu.pdfIn PDF document text
    • https://cdn.sqhk.co/vatomepipiw/ig85WX5/jutivisupuputisakudev.pdfIn PDF document text
    • http://marketeuro.pro/46756535406sww44.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/how_to_import_audio_file_into_garageband_iphone.pdfIn PDF document text
    • https://xuvivodoxanujo.weebly.com/uploads/1/3/5/3/135308848/4899551.pdfIn PDF document text
    • http://rinujajija.getenjoyment.net/how_to_check_meter_reading_bill.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nufitexevav.rf.gd/abel_korzeniowski_come_gentle_night_sheet_music.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/51846227198.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/rugituvovodeponepasegiges.pdfIn PDF document text
    • http://xirixufo.epizy.com/zadapenowedalufi.pdfIn PDF document text
    • http://vobikeretuwof.atwebpages.com/acute_renal_failure_in_dogs.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 5408 bytes
SHA-256: 24428d438dbd93f457b1f3b7170a6f0a2b67bf1e5c4cf96954e9b3d1b0334f00
font_01_sfnt_off0000f612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF612 11516 bytes
SHA-256: ff75d4de2849e03a71683ed754b2b9005e1b8fe6a19dcb20d58bf6170db4b573
font_02_sfnt_off00011d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D33 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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