Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd4bd157cca9f78…

MALICIOUS

PDF

70.4 KB Created: 2021-03-25 21:07:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d85ecfa58a8d4b0271b274f7be6c38a SHA-1: cfe4480a1de003301ee9564f7bcf1393957b1f29 SHA-256: 2fd4bd157cca9f78720f9241b9e25a39e88f1746cdd4bc386ac22ed097ebca7b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a link farm designed to redirect users to potentially malicious content or phishing sites. The document body, though heavily obfuscated, contains references to 'Starbucks barista pay california 2021', likely a lure to attract clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/aws?utm_term=starbucks+barista+pay+california+2021
    • https://jisenevezapa.weebly.com/uploads/1/3/4/0/134095859/4dcc8fe4b7db8.pdf
    • http://madawuboso.sportsontheweb.net/pitasulo.pdf
    • http://sallles.ru/haruki_murakami_ranking6ymg2.pdf
    • http://liketime.fun/nfl_schedule_2015_playoffs_2015-16rkq0l.pdf
    • http://kurs1.xyz/abingdon_school_uniform6wkvw.pdf
    • http://paktum.pro/lista_de_verbos_para_nios_en_ingleskfa0q.pdf
    • http://waranijovuv.sportsontheweb.net/28808368154.pdf
    • http://organize.shop/soxuxukitilomumegoxije7rniu.pdf
    • http://rugegav.mywebcommunity.org/english_course_for_adults.pdf
    • http://egrn-order.online/vrml_viewer_5._1fjj4w.pdf
    • https://natitapa.weebly.com/uploads/1/3/1/3/131379406/9833543.pdf
    • http://myfoxing.online/ludodetosobulaxopuguzsemiy.pdf
    • http://sq11mini.com/429655295960wt5w.pdf
    • http://7lessons.fun/super_mario_world_adventure_gamenabn4.pdf
    • http://webmastervlad.ru/kiera_cass_the_heirm99sd.pdf
    • http://idealicaitalia-official.site/asgard_valhalla_walkthrough1h8lh.pdf
    • https://jutijodofolumel.weebly.com/uploads/1/3/4/0/134012985/f91f53cc.pdf
    • https://jizetexosobuwek.weebly.com/uploads/1/3/0/7/130740437/gidaruwe-dewetopefemabi-jusaxibetufama-jozibuxi.pdf
    • https://jinitemolo.weebly.com/uploads/1/3/1/8/131856214/mesuzujazepiriziwe.pdf
    • http://lnstagramcopyrightservices.org/pipoxevigopitusdolgz.pdf
    • http://securityverifiedservices.com/pollo_enchilado_frito60fzh.pdf
    • http://reflectionss.space/ben_coloring_10_hero_aliens_vs_robotsssx9s.pdf
    • http://zijixiteluwek.scienceontheweb.net/26328797990.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000d3ff.bin
b33d66e5dd16e92a88685ae91e24d2b2dd39c058b4a8b7c017f7536e9adfc447		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FF 5744 bytes
font_01_sfnt_off0000e7ac.bin
64108fd4471da6dd3ff25369669c0b24bf65d0136fe8c9bc9873da7ed34e98cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 10800 bytes

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