Malicious PDF — malware analysis report

Static analysis result for SHA-256 182c94e0fb7d0e9e…

MALICIOUS

PDF

73.4 KB Created: 2021-04-24 02:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bf134a0c4b6a6b93bb6d4d1b1e92b8e7 SHA-1: 185d8ae29f6425ed88ff725d352f67cf1396ce0a SHA-256: 182c94e0fb7d0e9e4720c127f6790bb4b91cb03f12d8f7c76d6bb1bd6024e060
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/strik?utm_term=student%2527s+solutions+manual+for+organic+chemistry+9th+edition PDF link annotation
    • https://wabegikabakupoz.weebly.com/uploads/1/3/4/6/134668284/ede29dfed0.pdfIn PDF document text
    • http://mateguwokalidub.getenjoyment.net/sejekududofazafinov.pdfIn PDF document text
    • http://neletaparufo.scienceontheweb.net/davv_cet_syllabus.pdfIn PDF document text
    • https://wasizizinawuj.weebly.com/uploads/1/3/6/0/136096362/jabosusudabumuzepoka.pdfIn PDF document text
    • https://mefewenitili.weebly.com/uploads/1/3/1/3/131379946/wirotupuba.pdfIn PDF document text
    • https://remezovegaz.weebly.com/uploads/1/3/1/4/131406605/mideni.pdfIn PDF document text
    • http://popibiku.22web.org/yard_machines_snowblower_oil_change.pdfIn PDF document text
    • https://rowumojonudelaz.weebly.com/uploads/1/3/4/3/134335227/detepaberogatini.pdfIn PDF document text
    • https://loromosukatilif.weebly.com/uploads/1/3/4/7/134774062/4765680.pdfIn PDF document text
    • http://memaberenux.scienceontheweb.net/tasuzoduv.pdfIn PDF document text
    • http://juvasojiwal.66ghz.com/45270528250.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/chemistry_book_class_12.pdfIn PDF document text
    • https://wepuporo.weebly.com/uploads/1/3/2/7/132741302/f79c7e92ed06.pdfIn PDF document text
    • http://pumutug.iblogger.org/96234115018.pdfIn PDF document text
    • https://wilowukodol.weebly.com/uploads/1/3/4/8/134881933/sifurojaxu-mokurosib-pawozilixa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rilojanegesov.epizy.com/26826456032.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_3dbca7440d7b4039a74e87824908e852.pdf?index=trueIn PDF document text
    • http://boreduse.rf.gd/67891322179.pdfIn PDF document text
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_31aec372d9a24beb9515885e607b6fe6.pdf?index=trueIn PDF document text
    • http://pemuginikuj.epizy.com/pdf_exceptional_c_47_engineering_puzzles_programming_problems_and_solutions.pdfIn PDF document text
    • http://tizovosavudufi.rf.gd/adobe_acrobat_reader_for_windows_10.pdfIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_a2b7702a78a34a29bd25f0643da5410b.pdf?index=trueIn PDF document text
    • http://tujijekaxevon.rf.gd/hong_kong_visa_application_form_for_nepalese.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_off0000db2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2A 5828 bytes
SHA-256: 335ed7ecdf51c3b8ec1fe17008a6f8d8ed8ef3748cf40ea144cffd2157267313
font_01_sfnt_off0000eee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE6 11380 bytes
SHA-256: 53da8233e5ff68b9938617d92f3173ae994eee8b962c22ebed5f190ed5c5888e