Malicious PDF — malware analysis report

Static analysis result for SHA-256 23cc0359f60aa3ce…

MALICIOUS

PDF

94.3 KB Created: 2021-03-25 06:53:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1df0e444e72c1d76bf3e9eda27bd0e5b SHA-1: 5c49b8e3fd887c475add6294e29f20b0de2d722f SHA-256: 23cc0359f60aa3ce9c5c07ef66be2d23be085b2c0031df3837bb85ba538d3843
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to disposable hosting or redirectors, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. The document body appears to be corrupted or obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://yafferge.ru/wix?keyword=biogeochemical+cycles+webquest+worksheet+answers In PDF document text
    • https://jarivilil.weebly.com/uploads/1/3/4/0/134012847/wawux.pdfIn PDF document text
    • https://cdn.sqhk.co/ruperodu/7jdhezE/barber_courses_manchester_uk.pdfIn PDF document text
    • https://nuribivavis.weebly.com/uploads/1/3/4/6/134625990/23f75214a5711.pdfIn PDF document text
    • http://thepropheticapp.com/amartya_sen_the_idea_of_justice_reviewlm060.pdfIn PDF document text
    • http://dostafood.xyz/accident_report_bbc_newsyshnq.pdfIn PDF document text
    • https://nuzozixajalupik.weebly.com/uploads/1/3/0/7/130739607/f4f536d7e445.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/aoHhgij/minecraft_clicker_test.pdfIn PDF document text
    • http://vinograd.io/mobakexusadovofen3kw.pdfIn PDF document text
    • http://copyrighthelpcentral.com/zaluxesutegukikusupof3kni.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/ficSuii/legusunovogamevolujapo.pdfIn PDF document text
    • https://gimimelaxagoke.weebly.com/uploads/1/3/2/7/132740951/c98b74.pdfIn PDF document text
    • https://mafobosapufi.weebly.com/uploads/1/3/4/5/134505980/3680ec9e.pdfIn PDF document text
    • http://foyou.store/39455922122qlipb.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/ihKjjcR/bezujekudukofena.pdfIn PDF document text
    • http://muzoc.xyz/71308652008q7div.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_504c362126744cab9b33425767685784.pdf?index=trueIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_35a6566cf0414c79a7e44bd4c04242c5.pdf?index=trueIn PDF document text
    • https://2a26c5f8-c4f8-4af8-830b-7e2c9961bd8e.filesusr.com/ugd/2e4362_f5e8435454c148ba85fd57f74c6a3104.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5bc759a-4272-4022-ba1e-0cf52beeb0db/gududutogokikijad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6a2f34f-d3f9-44cc-bb62-1e4947effc7a/sarah_j_maas_net_worth_2020.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_b494862b334a496da712aa1c8a949e73.pdf?index=trueIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_789bbfd5108e4856b6032fbe658798c3.pdf?index=trueIn 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_off000131fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FC 5784 bytes
SHA-256: 3b141ad2bfb71b4a42628b534e25cc7c1852addaa7cad992ae6d679860b33927
font_01_sfnt_off000145a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A2 11088 bytes
SHA-256: 243e112c5886f30d44c71483e6463fcd341bbff3bc04c69c7d4f19b847897ac7