Malicious PDF — malware analysis report

Static analysis result for SHA-256 5252373e375c52ee…

MALICIOUS

PDF

76.9 KB Created: 2021-03-15 01:31:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 35b47725607a308022358c6dd5fb5090 SHA-1: baa53f5b9b3a254067ee7c9d9b3d9af1ee200fcd SHA-256: 5252373e375c52ee48c5b1024a61497dec4a68cfb8e783a14b964fe791fb8e60
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. One of the embedded URLs, 'https://nipisod.ru/strik?utm_term=ibm+selectric+ii+ribbon+not+advancing', is likely part of the attack chain, directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://nipisod.ru/strik?utm_term=ibm+selectric+ii+ribbon+not+advancing PDF link annotation
    • http://gallery-shop.site/duliwilixugovarixm42oa.pdfIn PDF document text
    • https://cdn.sqhk.co/lepagesali/D8wjjja/animal_crossing_celeste_always_meteor_shower.pdfIn PDF document text
    • https://guxuxexor.weebly.com/uploads/1/3/0/7/130775085/mowivodu.pdfIn PDF document text
    • https://cdn.sqhk.co/fejipotegevi/rbcogfZ/av_malformation_liver_radiology.pdfIn PDF document text
    • https://kasasifu.weebly.com/uploads/1/3/4/6/134697732/pinomimenanoxe-netazoxozis-pinede.pdfIn PDF document text
    • https://cdn.sqhk.co/pilozarager/jb6giie/68141754699.pdfIn PDF document text
    • https://mirepabokotixiz.weebly.com/uploads/1/3/2/7/132712407/pafugotexox_wizobife.pdfIn PDF document text
    • https://didilajuti.weebly.com/uploads/1/3/4/5/134585724/1622696.pdfIn PDF document text
    • https://cdn.sqhk.co/goxupolofodi/gf3bxig/freeze_dried_strawberries_meijer.pdfIn PDF document text
    • https://sanajupa.weebly.com/uploads/1/3/1/4/131406847/3185370.pdfIn PDF document text
    • http://canonsburglake.org/descargar_pokemon_blue_kaizo_romi0nzw.pdfIn PDF document text
    • https://cdn.sqhk.co/lowovegoxoji/Yhdhcjh/20294578944.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/b101b76a-bf7b-4944-875e-2eeb4b2ab004/incropera_heat_transfer_7th_edition_solutions_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/kivoferakirifo.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/abrasive_wheel_test_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d29cb1ba-ed43-45ac-98f7-fb16c5ec6f27/wegaded.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54cb41e6-e61f-4703-890b-4dc266de1a2e/why_is_my_samsung_refrigerator_making_a_noise.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/navigation_bar_android_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ea47ca-2487-4fc1-9952-5bc24ef6f5ff/nozitefisupibadiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3cc94cb-6750-4299-801b-857c34b15bb2/bewetumizulifapokezedidog.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/fall_ceiling_design_pictures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3cbc78a-0e49-473e-b366-ef734b2dd606/32651173352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83911b6b-0125-4441-9f0b-76dee28de3fc/17082018268.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/is_the_show_fresh_off_the_boat_cancelled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcf2feb5-17f9-4c92-ba76-b65e96d2efa0/sas_ods_rtf_text_options.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f2e4841-b78d-4733-8207-7c72b448ae3d/what_is_the_american_healthcare_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6ef35eb-dbd2-494c-8000-1a5b98b7e3ef/narokoburosepunomijagibi.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_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 5396 bytes
SHA-256: d3a2c605700f3f66c1c4860a39f802dfd27c4bfe426e520881b1e242dec4cb91
font_01_sfnt_off0000ffaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAA 11068 bytes
SHA-256: 345e48f3244b5809b8db62609699eaefad85be535ab3a286afb33365579b965c