Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2455872b9a0e97…

MALICIOUS

PDF

75.8 KB Created: 2021-02-11 21:43:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4d5a10c4ab33bb145a86c3ddf5d8edd0 SHA-1: 1a9438a1851e38e157510092b2833988cdb93dc3 SHA-256: 1b2455872b9a0e97281e95201ac8a30d09b0fb516a5a4be5ef94018bf917d44b
226 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The presence of a 'Clipboard command execution lure' heuristic indicates the document likely instructs the user to copy and paste commands into a shell, a common technique for executing secondary payloads. The numerous embedded URLs suggest a link farm designed to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://jottigo.ru/123?utm_term=scotland+county+register+of+deeds+biggs+street+laurinburg+nc PDF link annotation
    • https://cdn.sqhk.co/fitodofafe/hfghigI/step_by_step_origami_crane_instructions_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/lijuwezasip/RtfhbXi/diaphoresis_causes_drugs.pdfIn PDF document text
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/vofavoba.pdfIn PDF document text
    • https://sekikeke.weebly.com/uploads/1/3/4/7/134739811/narawis-xofusajuda-wivumaweved-zokane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_6025748b51cab.pdfIn PDF document text
    • https://cdn.sqhk.co/girasufu/hcBSNgU/90734802139.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/chehra_hai_ya_chand_song_saagar_mp3_downloadt5nj8.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/hb30rSU/end_it_all_meaning_in_english.pdfIn PDF document text
    • https://vetinuvejozijuk.weebly.com/uploads/1/3/4/7/134745319/3513675.pdfIn PDF document text
    • https://cdn.sqhk.co/gukomoluda/iavKzja/30180569426.pdfIn PDF document text
    • https://cdn.sqhk.co/rutunidosaw/gtjeQSj/learn_business_process_management.pdfIn PDF document text
    • http://edarudost.online/guess_the_creepypasta_free_download8oeot.pdfIn PDF document text
    • https://cdn.sqhk.co/revogonesox/iI71gga/applocker_iphone_11.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/hj0jbP3/jugipazulotaletopirogop.pdfIn PDF document text
    • https://cdn.sqhk.co/fixuzigetir/dtfiif2/game_pro_magazine.pdfIn PDF document text
    • http://mavito.online/test_automation_estimation_template_xlsh38it.pdfIn PDF document text
    • https://kofovozeregom.weebly.com/uploads/1/3/4/3/134313602/kevivufe_gamawuzaneko_nanezegarumej_romexapobibu.pdfIn PDF document text
    • http://trikolor.site/739005372603oadi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426271/normal_5fd1d4c96859c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 5536 bytes
SHA-256: 2fb905236141018b862c332ed0fd19ef3f2c6481f6d7d2bd9baebe1de1816bf0
font_01_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 10820 bytes
SHA-256: 36e67ce5061a70d0f5d2a07213fa91a9e4773f019e7a64165ce38706a269eb5b