Malicious PDF — malware analysis report

Static analysis result for SHA-256 0891e4d59117a338…

MALICIOUS

PDF

75.6 KB Created: 2021-03-04 19:07:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9545ec0953bff4bf09ed653848ce60f1 SHA-1: 3470a30e64c9ad0a25fa95ec9d51c7b20cbb3713 SHA-256: 0891e4d59117a338932f1c4e97a865c788593daf6d3908411c218fcfc6bc6d9a
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector pointing to 'https://crophysi.ru/strik'. The document body, though heavily obfuscated, suggests a lure related to currency brokerage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+become+a+currency+broker In PDF document text
    • https://cdn-cms.f-static.net/uploads/4480753/normal_600ea1a1451a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459477/normal_5ff070f6da659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479707/normal_6022d77263595.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409236/normal_5fe4161710a5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2977f12-8b49-4b28-b2e9-5ed288619425/sugezivenokexavomixog.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/amazon_double_bed_sheets_299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50196e82-50bf-4ed4-9246-33c125d8ed67/public_administration_jobs_atlanta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e11dbaf6-6e2b-4f33-acd5-5db04a070991/nitelufonifidowene.pdfIn PDF document text
    • http://rofivotika.rf.gd/what_is_the_skip_back_button_on_bose_700_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cfba9f2-fe56-438d-94de-cd6e9af4362c/24005813113.pdfIn PDF document text
    • http://zurutoraxavifes.rf.gd/dufifunelebabawus.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/sample_answers_for_scholarship_interview_questions.pdfIn PDF document text
    • http://nufasezizanewi.epizy.com/16282105546.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/netugip.pdfIn PDF document text
    • http://jutivowewinuled.epizy.com/luxuxowomuniga.pdfIn PDF document text
    • http://xilibosukotijob.epizy.com/koludilevesabaxepox.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/phn_mm_ct_file_trc_tuyn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad08730-d70f-4cb6-8dc0-de1b1cda8ab8/pasevosonuzaledibu.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/what_is_the_fourth_book_in_the_after_series.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_off0000e8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E1 5096 bytes
SHA-256: 6622fe722b2817f995f92931713962a9ef497fb1f06412c629cb3e49e96786dd
font_01_sfnt_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 11984 bytes
SHA-256: fcdc16bfc94bdfea85900a7704b1084c52c41dea7e278f48668bec8fe994ffde

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