Malicious PDF — malware analysis report

Static analysis result for SHA-256 8843f601c8f07370…

MALICIOUS

PDF

96.2 KB Created: 2021-04-09 10:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b85a7d7ec4955102d62a074361a09b43 SHA-1: da7306b652245045b4a2a141d7da265b3be16bff SHA-256: 8843f601c8f073705744fb94aa58210b15f591299289962b2eebe92434c063bf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, with one pointing to a Weebly subdomain. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL and the document body, which appears to be a garbled search result, suggest a lure to a malicious website.

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 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://resalured.ru/strik?utm_term=what+does+h6+mean+on+ac PDF link annotation
    • https://nilazarokidimud.weebly.com/uploads/1/3/4/4/134495838/ead8d6063fe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392462/normal_6052daf2a9fae.pdfIn PDF document text
    • http://useporte.xyz/pavaviq4925.pdfIn PDF document text
    • http://mexicotop3.xyz/nutone_central_vac_extension_hosev1sog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_6062ef90467dd.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/tojetata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_600aec4db2605.pdfIn PDF document text
    • https://cdn.sqhk.co/zixagiko/egUiiFa/47988164980.pdfIn PDF document text
    • https://cdn.sqhk.co/japuwejede/gcUs7Ei/dca_online_form_last_date.pdfIn PDF document text
    • https://cdn.sqhk.co/dukapudubi/xJHiiRU/celestial_sphere_model_of_the_heavens.pdfIn PDF document text
    • http://rodina38.ru/jokowedii50fj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_60562d9cda639.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456134/normal_600134c734214.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sitok/zambia_news_report.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/5181139503.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/b_e_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/rotterdam_port_guided_tour.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/haier_10000_btu_portable_air_conditioner_qpcd10axlw.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/worksheet_2._6_factoring_algebraic_expressions.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/breitling_aerospace_evo_night_mission_yellow.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/how_do_i_transfer_my_jvc_camcorder_tapes_to_dvd.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/automatic_clicker_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/alveus_formic_20_91.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_off00013c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3C 5216 bytes
SHA-256: bf3a6cdd4e3744b0c6aa559d3d247ffea67230dc6fc7436ae4ca2679b4a4682a
font_01_sfnt_off00014de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE8 11064 bytes
SHA-256: 4bbc1f529de66f0779af42e9e1fc656ee3b1b4df7644a1a827329aeb8b2b6b91

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