Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4f136491f23d77…

MALICIOUS

PDF

79.0 KB Created: 2021-05-09 16:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e84f21955abbb266609f74433f9f5134 SHA-1: 4aba5c4b39c56a986e52307c031d211bc71c4574 SHA-256: fd4f136491f23d77459ac3da455eb9d5b2c5d52ba5aed1d26cf4c8662f3060c5
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to a phishing site disguised as a helpful article. No scripts were extracted, but the PDF structure and URL analysis are sufficient to infer a phishing attack pattern.

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
  • 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://botokaw.ru/strik?utm_term=what+kind+of+battery+does+a+weight+watchers+scale+use PDF link annotation
    • http://manovina.mypressonline.com/conflict_resolution_skills_in_professional_nursing_practice.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/2473645164.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/machine_learning_meaning_oxford_dictionary.pdfIn PDF document text
    • http://setafugeridol.scienceontheweb.net/77641432074.pdfIn PDF document text
    • http://gazedalepi.sportsontheweb.net/virolojenep.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/is_apple_pencil_compatible_with_ipad_mini_5.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/vepowageni.pdfIn PDF document text
    • http://mivabeb.iblogger.org/83051682596.pdfIn PDF document text
    • http://kebukodakaver.iblogger.org/mefosajiwobunej.pdfIn PDF document text
    • http://pufemebulod.22web.org/82155830408.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/61826199456.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/b9b44b2c-5574-47fc-bdb2-dbc998f53382/primeros_auxilios_psicologicos_covid_coursera.pdfIn PDF document text
    • http://nepawujununexo.epizy.com/79611997703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/701b7548-78ed-493f-afba-1dca51d054e9/how_to_change_wifi_password_on_hp_officejet_pro_8610.pdfIn PDF document text
    • http://tedusola.epizy.com/rinnai_r75ls_tankless_water_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3041833b-dbc2-4615-a6f0-788b41cf51a2/nonlinear_plot_structure_definition.pdfIn PDF document text
    • http://sakogabutal.onlinewebshop.net/circular_motion_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1afd4ad0-678a-40a6-ac8e-c4800ec1c0f6/ukulele_basic_chords_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc8c80b2-a1ff-4bea-ae4f-563ec934ebdf/line_6_spider_iv_30_guitar_amplifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc2ad75c-3c14-4183-84b2-88debb5d2c1d/49729649868.pdfIn PDF document text
    • http://natizuf.onlinewebshop.net/mosibivoriri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eee220bb-de27-40a2-9861-7f35e096dce5/50422893839.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_off0000f5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 5692 bytes
SHA-256: b231eb14440661a4e7099a142ffbd1904af1a0a13164bc852c2dc04be19e8a58
font_01_sfnt_off0001094e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094E 10952 bytes
SHA-256: bfdc3865f718b73c4d453a795b911622758177fcdd0eaa68ada212bc5af48b60