Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b8df099e5a6e9e…

MALICIOUS

PDF

78.4 KB Created: 2021-03-05 17:44:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9b7ca52b6214ce8f526c351ff4582fd2 SHA-1: 743dc4a1d634b0dc0bd468c6e3c3f213fdb19db8 SHA-256: 93b8df099e5a6e9e53affa026350b0960ef8933623c97e65f4d89bb6df0b3713
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and one specific URL `https://baarspo.ru/strik?utm_term=should+you+leave+work+on+time` is flagged as malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=should+you+leave+work+on+time PDF link annotation
    • https://cdn.sqhk.co/xovikojux/iLYjhhM/tablature_guitare_happier_ed_sheeran.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/how_to_draw_a_tree_house.pdfIn PDF document text
    • http://luchdobro.site/what_is_the_purpose_of_north_atlantic_treaty_organizationmzak5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466676/normal_60418bef26539.pdfIn PDF document text
    • http://fisidunetozusi.iblogger.org/bollywood_news_movies_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447252/normal_5fff9be2b752e.pdfIn PDF document text
    • http://trellos.fun/araby_summaryz4kt8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465394/normal_601cdf3f1fa73.pdfIn PDF document text
    • https://cdn.sqhk.co/vewimidipiv/hmjasCH/76357379018.pdfIn PDF document text
    • http://kpupnov.pro/sony_vegas_slideshow_templates_free_download6wc7d.pdfIn PDF document text
    • https://cdn.sqhk.co/gatavikap/pSKZidD/marcopolo_world_school_review.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/iiagdmH/36986579388.pdfIn PDF document text
    • http://ropisunofo.mygamesonline.org/60702356111.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joluror.rf.gd/adverb_worksheets_4th_grade_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6584e795-c189-4ff4-8b43-2ebf94424d99/harry_potter_books_vs_movies_reddit.pdfIn PDF document text
    • http://zelojagedalelo.epizy.com/hoover_windtunnel_3_pro_pet_uh70930_belt.pdfIn PDF document text
    • http://laganomezavarof.epizy.com/student_exploration_human_homeostasis_answer_key.pdfIn PDF document text
    • http://zexitan.rf.gd/how_to_redeem_fortnite_code_on_fetch_rewards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88349ab7-5abc-4974-9a4a-87a2b02afd17/nubadamopebaripumoter.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/vonusupili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95518e02-dbc1-4c81-bdb6-dfbf891cd47b/honda_gcv160_carburetor_gaskets.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_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 5308 bytes
SHA-256: b6be083f8e99c460fafa0e0d299e85d919338f68a5014300e71cd8225b78efaf
font_01_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 10632 bytes
SHA-256: 51f87cb75dfcc535a345bb749c837df07f0096271ffca4e793de090a8bce4c32

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