Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8f63a2f0d969a8…

MALICIOUS

PDF

142.5 KB Created: 2021-03-03 14:59:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 58f387dfcd648b138b9c21aaef07c646 SHA-1: 5b94c9140cffbd29f58fc8480146552f1b680723 SHA-256: ba8f63a2f0d969a8a8014262d7e1b7e7816bbce98c55c065080ffd51cd9ed8da
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown reputation URLs strongly suggest a phishing or malicious redirection attempt. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/wix?keyword=meiosis+matching+worksheet+answers+key PDF link annotation
    • https://pagazamis.weebly.com/uploads/1/3/5/3/135310118/sibigupesawiverozag.pdfIn PDF document text
    • http://foyou.store/dipevojubigoridemoti507cf.pdfIn PDF document text
    • http://gtmedis.com/chemdraw_software_for_mac_freewzl4h.pdfIn PDF document text
    • http://instacopyrightcenter.com/9215710643t6pnp.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/jagijcX/kubatixosatokajixadopi.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/pioneer_avh-x3700bhs_memory_full.pdfIn PDF document text
    • https://cdn.sqhk.co/samofetob/gcAWhcV/mowigomoduxuxusidemiku.pdfIn PDF document text
    • http://mastericy-chistoty.ru/que_es_educacion_basica_y_media_superior8bmcg.pdfIn PDF document text
    • http://normab-id.com/que_es_el_bosquejo_del_metodo_en_una_investigacionee193.pdfIn PDF document text
    • http://euroshopme.site/blackberry_android_mobiles_2018cos0v.pdfIn PDF document text
    • http://shop-onlain.fun/resume_template_singapore_20192wuvn.pdfIn PDF document text
    • http://ipoteka.net/weber_spirit_e-310_best_priceq1fda.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://s3.amazonaws.com/faduxodiwo/library_exam_questions_and_answers.pdfIn PDF document text
    • http://nukivamo.myartsonline.com/robunemor.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001df30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF30 5232 bytes
SHA-256: df4dce669b3579241d00736d3dabe98f3585f43cc73be13bc7237e199e9bb108
font_01_sfnt_off0001f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0E8 14472 bytes
SHA-256: 64bd58dc4296a20ed5ea2d2a5591ffab784b3665290a059f388dc389af7140eb
font_02_sfnt_off00021dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21DFB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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