Malicious PDF — malware analysis report

Static analysis result for SHA-256 513594ee0f89e317…

MALICIOUS

PDF

111.7 KB Created: 2021-04-25 21:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 155c4f96d8563c5707abacdfb9aacd71 SHA-1: e94337334567e16728a39f2711e8f04242f2fd0a SHA-256: 513594ee0f89e3174ea7c6a676c3138c956d5025e1abfa73f02045cdd0ecfacd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The primary IOC is the external URL https://kuzutuzo.ru/strik?utm_term=foucault+panopticism+mla+citation, which is part of the link farm.

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.
  • 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://kuzutuzo.ru/strik?utm_term=foucault+panopticism+mla+citation PDF link annotation
    • http://jinevul.mygamesonline.org/47569215481.pdfIn PDF document text
    • https://cdn.sqhk.co/mofisozulud/MSjb1oy/mitob.pdfIn PDF document text
    • http://koxudizujan.mywebcommunity.org/getselfhelp_worry_tree.pdfIn PDF document text
    • http://purubifo.medianewsonline.com/mean_value_theorem_problems_and_solutions.pdfIn PDF document text
    • http://niwopofe.scienceontheweb.net/dapupenizorojijitupipoxux.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/hgjfEja/pdf_annotator_free_portable.pdfIn PDF document text
    • http://devedilazabu.medianewsonline.com/6891146582.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_911eeb55b07c4817bd10403b2df8d2c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cc3c5d1-2908-414d-b5ad-398514a7bbab/10027049783.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_b3a18c90684848bb985cf4c64a8ceeff.pdf?index=trueIn PDF document text
    • https://badbb018-ab4e-499b-b788-960949b82e3d.filesusr.com/ugd/4f4c56_e9d263df32574286a97ce7c381a82354.pdf?index=trueIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_d5d5a38b65aa469eb124ff06f5f21e99.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/16f104d7-b66f-4009-8b87-be2ec039a45b/down_the_rabbit_hole_vr_lunchtime.pdfIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_f326c1db8911411e88a81cba16cd0630.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kisagoz/balance_sheet_format_india_in_excel.pdfIn PDF document text
    • http://fazovalekotevo.onlinewebshop.net/ielts_writing_task_1_general_answer_sheet.pdfIn PDF document text
    • http://zasuwunal.myartsonline.com/xirobilimomiwedugujiziru.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/govuvojaxasawejuf.pdfIn PDF document text
    • http://wavexijazibivat.myartsonline.com/armitage_shanks_blue_book.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_off000179a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179A4 4940 bytes
SHA-256: 7651eb4089decf7bfdadab25cd49147673a96f6dd585f185dd0c12f59e7582f6
font_01_sfnt_off00018a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A64 12448 bytes
SHA-256: fe9b654bb3c08533b5a4bec5cf724f3f8e23c18692073d6ecfeab8f52398669f

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