Malicious PDF — malware analysis report

Static analysis result for SHA-256 764a156fac364069…

MALICIOUS

PDF

77.4 KB Created: 2021-04-18 10:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8723f0a6a2c69aef0c4204aee72edad1 SHA-1: 10e59bcd5155230a61ceba5ec5142d7d0b4d2a65 SHA-256: 764a156fac3640692d0c14df051a5ebdf49a21513336ede82b9a92e9a4e60f35
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9995

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://gimoguvi.ru/strik?utm_term=a+christmas+carol+2019+cast+list PDF link annotation
    • http://delozofize.scienceontheweb.net/50034326142.pdfIn PDF document text
    • http://zoosalon.org/60405277313nlzvq.pdfIn PDF document text
    • http://activa-fb.com/bimogubagujcxlz8.pdfIn PDF document text
    • https://cdn.sqhk.co/wojomisew/eicEtgg/alien_shooter_2_conscription_crack_full.pdfIn PDF document text
    • https://cdn.sqhk.co/pikikunifav/p37lFT9/catia_manual_free.pdfIn PDF document text
    • http://goodik.fun/greek_to_english_bible_translation8asev.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/123xFBh/lenovo_yoga_7i_15.pdfIn PDF document text
    • http://gadivawiw.sportsontheweb.net/50571376017.pdfIn PDF document text
    • http://ketorebagibof.22web.org/dj_baul_song_free.pdfIn PDF document text
    • http://pirunumilusarib.sportsontheweb.net/mecanica_automotiva.pdfIn PDF document text
    • http://bafedudovodamo.medianewsonline.com/46350181100.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/38201058994.pdfIn PDF document text
    • https://cdn.sqhk.co/xogutozo/jdvEgd5/lazeselu.pdfIn PDF document text
    • http://mizarujil.mypressonline.com/43649134326.pdfIn PDF document text
    • http://lenudes.com/titewulosidutiputusurukerst6gk.pdfIn PDF document text
    • http://xivazokib.medianewsonline.com/temaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://litipodetipuwi.epizy.com/mahatma_gandhi_jeevani_in_hindi.pdfIn PDF document text
    • http://dapukagizepor.rf.gd/reset_form_to_default_values_angular_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ddeaea5-1764-43c2-a239-b72975988feb/spyder_xtra_custom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf32e998-1620-47df-9a6a-53e6f68d2e81/why_would_a_positive_pregnancy_test_turn_negative.pdfIn PDF document text
    • http://menowawonip.rf.gd/buku_agama_islam_kelas_12_penerbit_erlangga.pdfIn PDF document text
    • http://nikavavufuxirel.epizy.com/groupe_bpce_financial_report_2018.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_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 5508 bytes
SHA-256: 3f11c11fe5e829c3be5a66d01262f740d984a64050c6080f18f93cb3cff44aab
font_01_sfnt_off0001054e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054E 10172 bytes
SHA-256: 674b27f9296b98cb4e4e58afd03f016d51adb84a50192472ca69dd4f275235c4

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