Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5f8b3d76af0eb0…

MALICIOUS

PDF

76.8 KB Created: 2021-03-16 06:35:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d41962b78402599f47f5cc017e936f1a SHA-1: b759d9132f56d8919ad1fb347c926127e502837c SHA-256: 9f5f8b3d76af0eb041bcac6147732843f7649a9e302073e4455ef922a642c064
186 Risk Score

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. 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 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/aws?utm_term=standard+navy+valve+technical+manual PDF link annotation
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/fedimixavilirade.pdfIn PDF document text
    • http://keziwir.iblogger.org/xirowisepisujuni.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/gt9hiij/doubletree_hilton_burlington_vermont.pdfIn PDF document text
    • https://kavejujutafen.weebly.com/uploads/1/3/6/0/136022690/devakazevuzalesepa.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/mi1YjgU/arctic_wolf_networks_careers.pdfIn PDF document text
    • https://lamujotidavupat.weebly.com/uploads/1/3/4/3/134375272/4382044.pdfIn PDF document text
    • https://cdn.sqhk.co/jevipugirofi/ijUygc8/bawomaxuvigepoj.pdfIn PDF document text
    • http://nosaraxes.22web.org/ssc_stenographer_2018_application_form.pdfIn PDF document text
    • http://bekowakiged.iblogger.org/business_informatics_salary_in_egypt.pdfIn PDF document text
    • https://feliwisinawo.weebly.com/uploads/1/3/1/8/131856919/zewomewotisug.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/jb1tile/monkey_mania_bankstown_reviews.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/babexinapazeximomano.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_9032c563c02243c6a9271a2467e6a3d9.pdf?index=trueIn PDF document text
    • http://dapizodipe.myartsonline.com/61271664059.pdfIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_12b4418938c540cb9cedf2e961c9397d.pdf?index=trueIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_100cd6728291477d925dd8de1420cbb1.pdf?index=trueIn PDF document text
    • http://nuwumunis.epizy.com/12871588699.pdfIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_dd63ec2bd3d549329ab48617b318dfde.pdf?index=trueIn PDF document text
    • http://rexefobixavater.myartsonline.com/autisme_infantile.pdfIn PDF document text
    • http://kenewemugine.epizy.com/tolawuwe.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_5cd7fb951248436099f5da6168188e2c.pdf?index=trueIn PDF document text
    • http://sedubidazos.epizy.com/esc_guideline_2018_hypertension.pdfIn PDF document text
    • http://vaxuraribo.rf.gd/71227038693.pdfIn PDF document text
    • http://gakajitaju.atwebpages.com/interview_letter_format.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_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 5264 bytes
SHA-256: 21d256679157ce32772e29d4ad2128a3c8e7ef6c66391e6c724d78901df2764a
font_01_sfnt_off0001021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 10416 bytes
SHA-256: a00ed2d210c0a59b807ea66b10561a4788195f958216cd96e062ea7ccbcb1b15