Malicious PDF — malware analysis report

Static analysis result for SHA-256 159fd5f71241c75d…

MALICIOUS

PDF

117.8 KB Created: 2021-04-27 19:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d2d49b68dadab257de5a415b0e6824d2 SHA-1: 767a025de351eede5a7be8a5f925beebd1412f37 SHA-256: 159fd5f71241c75da2c4d5f95fe36962e820616a89ac79ac286a1073b007dd1e
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a PDF link farm. The ML classifier also strongly indicated maliciousness. The document appears to be a lure, using the pretext of free books to drive traffic to potentially harmful websites.

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
  • 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 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.
  • 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=alice+bailey+books+free In PDF document text
    • http://zoosalon.org/half_blood_prince_spell_booklcuo0.pdfIn PDF document text
    • http://ig-objectionform.com/xokivamumigoxasofex11m.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/industrial_air_conditioning_system.pdfIn PDF document text
    • http://takipleskazan.org/famepuvivugipexasazipo3qzl.pdfIn PDF document text
    • http://tibetterrier.ru/que_es_el_ensayo_argumentativowr5op.pdfIn PDF document text
    • http://stepka2016.xyz/the_official_sat_subject_test_in_biology_study_guide_college_board_official_sat_study_guide032pf.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/745ff076-5cbd-45b5-ad97-233208fe9c13/13063986012.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/washing_machine_not_spinning_properly_beko.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/jiwibatapekiwepazogifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90bd4b7c-b688-42a6-949b-d83d438ad12d/92766577018.pdfIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_a7757dfb144d4289b31cbe8f2b19c182.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_2288cd948ee84a46a9293d479b58a4bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/13966717180.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/the_man_nobody_knows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/621e9b19-c3fa-4d11-8ca4-2b8944f198d8/seguvofonavinugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19119de2-7ada-47a9-a35c-c90afa1c5397/azar_grammar_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a2e4f8-35f6-43e0-a544-35c1a4c112ba/8921241457.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/online_video_cutter_free_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/carta_de_derechos_del_paciente_pediatrico_en_puerto_rico.pdfIn PDF document text
    • http://witesenigo.atwebpages.com/rutuxexesavaxoti.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/solving_equations_by_factoring_answers.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_off00019055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19055 5168 bytes
SHA-256: 0b0265b2d7f0c6f06cd9e08dc538cf3a0d238ba9f7f533aa4bf46888c24c6a5c
font_01_sfnt_off0001a20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A20A 11776 bytes
SHA-256: 3df40808b696f5cfac3c24d5b48872b819c2f8239c9a56ef4a16e5767eb56854

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