Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cb9d4780c0d908…

MALICIOUS

PDF

80.4 KB Created: 2021-05-12 21:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: aa5efb0abd6e656d89454c71659a9dc0 SHA-1: 73145a0c066471039164b7eae221c668e09a72c0 SHA-256: 39cb9d4780c0d908918eab872e042379f8c1f7a5e342dd7e66728d22f518eb1a
186 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous external links, many hosted on disposable domains, suggesting a malicious intent to redirect users. The presence of a link related to 'stock markets crashing' combined with the ClamAV detection of 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution lure. No scripts were extracted, but the PDF structure and embedded URLs point towards a malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://soxebez.ru/strik?utm_term=why+are+the+stock+markets+crashing+today PDF link annotation
    • http://musomojil.mywebcommunity.org/5755958595.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/63723106161.pdfIn PDF document text
    • http://fejiximodanu.mygamesonline.org/bbc_compacta_class_11_english_answers.pdfIn PDF document text
    • http://pusewuvi.medianewsonline.com/who_discovered_logarithms.pdfIn PDF document text
    • http://dojurajopixu.iblogger.org/what_date_will_easter_be_in_2021.pdfIn PDF document text
    • http://wozovumorawoka.sportsontheweb.net/easy_english_speaking_tips.pdfIn PDF document text
    • http://leludezoz.scienceontheweb.net/asterix_all_comics.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/1b602087-fb58-4396-b34c-e9fd6a139bb6/murray_lawn_mower_parts_walmart.pdfIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_d5d135d6e40944bfadca1fcd5fdc997c.pdf?index=trueIn PDF document text
    • http://zuxekesimulir.epizy.com/gakib.pdfIn PDF document text
    • http://givetupazowo.onlinewebshop.net/numbers_worksheets_11_20.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b73f8fee-eac3-4d80-a7df-5272a432c6c7/jabra_hfs100_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/168efe9d-de05-46ce-95f1-ba3016ca8d26/mechanical_engineering_jobs_in_chennai_for_freshers_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4a6f06d-9395-41d2-a9fa-cb16434d9506/daremusotis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c33287a-a655-49db-b0f2-01d78803d75d/nanodrop_spectrophotometer_prices.pdfIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_ac92446fd62649d597529b46b40c25a6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e654906-764c-4e39-8b3a-585325621c1d/93527194834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/021f0bff-ecfe-47cf-9459-536b65ac4d53/how_to_compare_continuous_and_categorical_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3917d0-3e68-4bc2-85e4-1a9a73e03e06/49491362076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2164052-9f96-4f11-8b35-73f0ac9e440a/how_much_is_1_lb_of_sweet_potatoes.pdfIn PDF document text
    • http://fevidubigozexa.rf.gd/89645564344.pdfIn PDF document text
    • http://duwopoduz.rf.gd/66926766749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84cb16e5-cc7a-43ff-9196-5f3877d632a7/22640530390.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_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 5500 bytes
SHA-256: dab67fa1192914033003e773e94d8b03ab1cea7ff200aee020299470cd1ad2c7
font_01_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 11220 bytes
SHA-256: 9609a6c35ab4df2f46cb560e04df1cde59dd7fb8379466cfdb3133f5a656944a