Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb2dfa83d5893b8…

MALICIOUS

PDF

83.0 KB Created: 2021-04-27 20:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bb8ef7e45cd44bae9ec5626d4410a7b2 SHA-1: c29dd94fe7bdd45a3f329215bf428d81e488a8f1 SHA-256: bfb2dfa83d5893b8c2f6f5fa4e6c36656947d1561ce4f7c12a62fbf9944ea544
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document that contains embedded URLs, one of which is flagged as malicious and used in a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though truncated, suggests a lure related to song lyrics, which is then used to direct the user to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=dirty+christmas+songs+jingle+bell+rock+lyrics PDF link annotation
    • http://lofitner.buzz/soft_matter_physics_doiuoo59.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/jiaKQ6L/24348152340.pdfIn PDF document text
    • https://cdn.sqhk.co/muxaferamet/Uq9jiL7/88081301057.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/jimexa2z7uj.pdfIn PDF document text
    • http://findattime.com/big_time_rush_boyfriend_musicqbry2.pdfIn PDF document text
    • http://fexodubavilukub.22web.org/weather_report_online_map.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_9c4cf5f32ea04c1384fa8e12f77d2d2a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4848fa58-9e19-4e28-b2ef-b26c9038fa0e/nasibibujafomemenisoj.pdfIn PDF document text
    • https://9c50f6df-e9c1-453e-a208-eff1cefe231f.filesusr.com/ugd/44b3dc_11fa67c24245415e9c4a7898672a0236.pdf?index=trueIn PDF document text
    • http://kalawutef.rf.gd/depojawiveletupikopaxi.pdfIn PDF document text
    • http://lagadasisipas.rf.gd/amoled_burn-_in_fixer_apk_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1260a8d-69ad-4ea6-88e2-15121eb9036b/65027260149.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/american_born_chinese_full_story.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/nexufizo.pdfIn PDF document text
    • http://sozitemow.epizy.com/frmulas_para_determinar_el_volumen_de_slidos_regulares.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d509efc4-2caa-466b-8c17-d9fbf77b033c/43822226847.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/saturated_steam_table_by_pressure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f101e05-93d0-4937-baaa-8f62a71a028d/19998442285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe58c053-eaee-4e3a-a61d-158729dcada9/waguzomewepozulip.pdfIn PDF document text
    • http://wajodojizofe.epizy.com/chrome_extension_instagram_images.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_off000105b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 5596 bytes
SHA-256: 1d7b81fe774994044649df52b2901c9ba02e42e2eb052500fb4f27d93912e243
font_01_sfnt_off000118a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A1 11356 bytes
SHA-256: 742ef2069b98270a9a5f320c4b8fe946a21fdb1d1d1659dc70ba205b85bf1c4b

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