Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82f3c69c3605d7e…

MALICIOUS

PDF

77.2 KB Created: 2021-03-23 10:54:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1e2674a9a429c06c7dbc9acf294d6c75 SHA-1: dbe0f0576fd02242fbc1370cb2ebcd941d5eef05 SHA-256: d82f3c69c3605d7eae4723c4e65f4fe6b22a33aac56db3469dd1518ddffe91f4
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the PDF structure and embedded URLs suggest it's designed to lead users to potentially harmful content hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kuzutuzo.ru/wix?keyword=maytag+service+manuals PDF link annotation
    • http://rafupofamurawaf.mygamesonline.org/city_of_fallen_angels_book_about_venice.pdfIn PDF document text
    • http://medemukiduba.sportsontheweb.net/student_information_management_system_project.pdfIn PDF document text
    • http://lufexaxoxak.mygamesonline.org/organic_chemistry_as_a_second_language_second_semester_topics_5th_edition.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/19792064186.pdfIn PDF document text
    • http://getcabinets.xyz/69131525955k7qa.pdfIn PDF document text
    • http://leree6.club/husky_health_insurance_ct_income_guidelineswnhfd.pdfIn PDF document text
    • http://tixshopclub.fun/copy_file_b_khao5vla.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/61fd1c45-78c4-48a0-90bd-1f78727c1320/38490837658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0c63ee2-c3a7-4288-80d6-090bd852986c/mutant_and_masterminds.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/advanced_grapher_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/xixaxuduliretogobelol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a7d03a-8135-4c41-ab75-7d436fade0d9/breville_smart_oven_pro_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/100_egyptian_combed_cotton_percale_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96c3d4d1-a31b-44de-8411-1ac6d6f65ae7/how_to_use_brother_computerized_sewing_machine.pdfIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_06e615faf2e34494a6a8f72525313c96.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d8fbe6d-9b04-4485-85b9-993f2004cfcc/nadowumapipedeguwifibos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abcab2a8-1e97-4646-88fc-537e7a765d75/pepomip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/633f0ba1-9e8b-469d-89c1-632b97ca7740/dirupijavipufotaxuwa.pdfIn PDF document text
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_a5d2f503fd934a20af74ba071e972ea0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b2b5ecc-1055-49f2-9ac3-8848aee38957/is_there_homeless_in_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c92d571-b204-4a51-bdd4-af8ab7e79467/97236188453.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/caucasian_chalk_circle_script_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/73983051225.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_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 5284 bytes
SHA-256: 329d1b90c205425271623f3c741b4d2f556b602153082d04d242e5206b57682b
font_01_sfnt_off00010056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10056 11212 bytes
SHA-256: b7a21132a4b8f1bc9c8ee61aa61d0472fc741251cb2468d7cec56471d84bda1c