Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b74c382dbc8a427…

MALICIOUS

PDF

80.5 KB Created: 2021-03-20 01:34:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d242d5874e1bff26047d7f6e4ff580b0 SHA-1: b2109118a116a36b7fdffb70adae71889435024b SHA-256: 0b74c382dbc8a4271116b0f20cdca2da59449a7f3f669d50590f1314d35b170e
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kuzutuzo.ru/strik?utm_term=how+to+program+your+playstation+3+remote PDF link annotation
    • http://mevakimuvu.mypressonline.com/glencoe_6th_grade_science_textbook.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/irjb3jb/windows_server_remote_management_port.pdfIn PDF document text
    • https://cdn.sqhk.co/bojowagawire/8Roher3/15932029565.pdfIn PDF document text
    • http://nozumupi.medianewsonline.com/ielts_speaking_and_actual_tests_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463264/normal_6033319f3c300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370737/normal_600de9f246e0e.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/EhaojdF/az_screen_recorder_no_root_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/dewavasese/aXifsoc/axgard_polycarbonate_clear_impact-_resistant_glazing_sheet.pdfIn PDF document text
    • http://degimogug.mypressonline.com/39485295989.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/vishnu_sahasranamam_gujarati_gita_press.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479707/normal_5fc808b86d0c2.pdfIn PDF document text
    • http://memiwuv.mygamesonline.org/how_to_use_google_maps_street_view_on_android.pdfIn PDF document text
    • https://cdn.sqhk.co/tinukomafiro/aUSDyib/75117860372.pdfIn PDF document text
    • https://cdn.sqhk.co/tavevalurov/EuheQie/international_business_machines_ibm_mision_y_vision.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411696/normal_603434e56c601.pdfIn PDF document text
    • http://rasidafepu.mypressonline.com/vatenipibezod.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/eoiayhd/11797130969.pdfIn PDF document text
    • https://cdn.sqhk.co/dovoxukeni/WdjdFib/automatismos_industriales.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/jjgcjiX/bluestacks_hd_app_player.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zedofaxuboz.onlinewebshop.net/bososejumalaweza.pdfIn PDF document text
    • http://sazoser.myartsonline.com/algebra_word_problems_worksheet_grade_7.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92C 5460 bytes
SHA-256: 518cde4a3f0fc7f33f1eb99d436b65d6a6d876b8734522638241f0207b82f6c5
font_01_sfnt_off00010bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 11872 bytes
SHA-256: 718fb8d4929f53aabcc7c437cbc975791a33d926b29dd1b814854362356d9377

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