Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e88899abcfb853…

MALICIOUS

PDF

74.9 KB Created: 2021-03-13 17:16:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7e554f9d017d0e1dc82e70826a4e9950 SHA-1: 6077472b4c0b51c907ba5f37a4ab1d16a0bb6246 SHA-256: 66e88899abcfb8538fa3132753e140f0eef77af1d4bf299feeda810cf5ca695f
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within it, including one that appears to be a lure for sheet music. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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=empire+strikes+back+trumpet+sheet+music PDF link annotation
    • https://cdn.sqhk.co/vilubofi/h2Mk6gg/22801285173.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/hejaWhj/horizon_credit_union_member_number.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/hirXepY/digital_marketing_strategy_template_free.pdfIn PDF document text
    • https://jimuvidagonolab.weebly.com/uploads/1/3/1/6/131636746/watelajomowadam.pdfIn PDF document text
    • https://dilazewinu.weebly.com/uploads/1/3/0/9/130969594/bonosirisosajisit.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/gjhhJvA/45671706553.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/Oqgjhfo/riwofusinitamedexuse.pdfIn PDF document text
    • https://fivalukovegobag.weebly.com/uploads/1/3/4/6/134693255/7071b7.pdfIn PDF document text
    • https://dudakodut.weebly.com/uploads/1/3/4/4/134497067/lajiveti_zukokulepotapo_gojafesonujika.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/gibnMjc/share_web_page_on_facebook.pdfIn PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/1126237.pdfIn PDF document text
    • http://kogejirupu.getenjoyment.net/99158597625.pdfIn PDF document text
    • https://cdn.sqhk.co/tiluzegata/WichgJd/giresejoxerofazedujamiso.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
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_bccc566b4baa4550bf4cb4cd73c4b0ed.pdf?index=trueIn PDF document text
    • http://rizivubonulej.atwebpages.com/3952648607.pdfIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_e6308380d3d7419eb559fb5d5696693f.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_9a4949901d5c48b08bd774e78e250712.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc0920ef-a25f-48da-8b30-ef9682ef6b25/2003_yamaha_kodiak_400_oil_type.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/zuviwewupiganiporadipir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/210d5747-017c-4c2a-8d7b-39be84be2662/lusopokitapivefus.pdfIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_4515b6b8d415418698684fa5f78b0118.pdf?index=trueIn PDF document text
    • https://8bee2916-85bb-4632-b494-424615dbadd5.filesusr.com/ugd/cacfd7_3cd61f6a12c04908b393ba8d780e08cd.pdf?index=trueIn 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_off0000ddf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF8 4968 bytes
SHA-256: 8e5dde2f638cb86377594f28b342d471cede173b90ccbc77eace28242902fb85
font_01_sfnt_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 9824 bytes
SHA-256: 21b120b1dc25d7466c706f257dceff0a53878a814983f86c6064d4abd259db0d
font_02_sfnt_off0001102a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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