Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b73821cf4da433…

MALICIOUS

PDF

69.7 KB Created: 2021-02-21 08:35:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: c7ee8b552b2ff67e15702f67dd7d4b4a SHA-1: 9b72e897f684bd36e562747adec0361d97af5009 SHA-256: 50b73821cf4da433c43f10972f77fd223ba129ddf5f9f1f7fb0aad82d5f4db1e
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://maypoin.ru/wix?keyword=the+moving+man+worksheet+answers PDF link annotation
    • http://chestlune.online/medical_check_up_form_for_work_permit7yk2y.pdfIn PDF document text
    • http://rubeatyshop.xyz/yamaha_48_volt_battery_charger_manualacdcb.pdfIn PDF document text
    • http://cparta.moscow/47421555570cfz29.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/4410202.pdfIn PDF document text
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/4029203.pdfIn PDF document text
    • http://teenagetutor.online/break_every_chainkojqq.pdfIn PDF document text
    • https://pupadidaf.weebly.com/uploads/1/3/0/8/130873798/vigusezonuzi-vomaledive-vezepopuxikoj.pdfIn PDF document text
    • http://beremoter.online/broadacre_city_conceptn5cor.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/zalomi/fluorure_d_ammonium_formule_chimique.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/zakufukugejek.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/biblical_interpretation_of_dreams_and_visions.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/best_gmat_prep_course_for_verbal.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/group_1_previous_question_papers_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/kotesozo.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/channa_mereya_punjabi_movie_full.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_off0000d5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AA 5232 bytes
SHA-256: 2596b933e0288b80087b6cd525d989dc48827cf4654796d737076f70728564c0
font_01_sfnt_off0000e75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75F 9936 bytes
SHA-256: 33e2a463d84a77f873aded2cf439d494b37789ea69b78e5f104558287ead29b4