Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfaa09525f4191af…

MALICIOUS

PDF

83.9 KB Created: 2021-03-10 09:36:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d60d34467c03357b0ad115e3129f5050 SHA-1: 79a69da9d14d54b846559b7da964e83c26e4c52a SHA-256: dfaa09525f4191afd72a1b9dc9c4f983534ecd0270cd0bf23dce46ec05fddaac
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or distributing malicious content. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful websites, such as the one found at botokaw.ru.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://botokaw.ru/award?keyword=bundesliga+spielplan+schalke+pdf
    • http://topcabinets.xyz/216778618215868g.pdf
    • http://accueilcmb.com/cut_and_paint_free_download_androidoljrm.pdf
    • https://fapopadiwa.weebly.com/uploads/1/3/1/4/131438416/2dd05c82f0c209f.pdf
    • https://zesujixiti.weebly.com/uploads/1/3/1/3/131398447/mepikutinawoweliwox.pdf
    • http://masterpowerpoint.com/wubalugujoginokamd42ka.pdf
    • http://prodson.fun/guion_para_pastorela_comica_cortann9jc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bokelur/bed_sheets_spray.pdf
    • https://s3.amazonaws.com/kopisigapub/acceptance_offer_letter_template.pdf
    • https://s3.amazonaws.com/napoledunadigo/aroy_thai_modbury_menu.pdf
    • https://uploads.strikinglycdn.com/files/a49593e5-fe21-456d-909b-089c2fb0a480/olentangy_local_schools_spring_break_2020.pdf
    • https://s3.amazonaws.com/sojebelevenex/24985606332.pdf
    • https://s3.amazonaws.com/jefobexapulow/fesegi.pdf
    • https://uploads.strikinglycdn.com/files/071a3281-51cf-4268-94a5-6a70d51a911e/does_teeter_hang_ups_work_for_sciatica.pdf
    • https://s3.amazonaws.com/tozaduliwubega/4d_live_wallpaper_for_pc.pdf
    • https://s3.amazonaws.com/wupagivoz/vasimovebizemeboral.pdf
    • https://s3.amazonaws.com/guwutivupudutu/best_light_reader_for_android.pdf
    • https://s3.amazonaws.com/paropabaru/flyer_templates_free_for_publisher.pdf
    • https://uploads.strikinglycdn.com/files/6a1803fb-a923-4ca3-9c44-c158484039f0/average_weight_loss_on_21_day_sugar_detox.pdf
    • https://uploads.strikinglycdn.com/files/d1025665-49cb-4d7e-996f-8af083cb4c04/teacher_stress_inventory.pdf
    • https://s3.amazonaws.com/daxemo/loparokorenavimavur.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fce8.bin
f816cc16e87ed978c7eb4deb20b9f849a456938dc82104ad66ecc44864027436
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 5436 bytes
font_01_sfnt_off00010f6e.bin
31a5581cbe58e2c81935d3cdb9ec7507f307f16eca574cf7750db5d7d1db9fdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6E 16340 bytes