Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b637c46f07dc18b…

MALICIOUS

PDF

77.9 KB Created: 2021-05-21 04:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ae08017589b5b412f673c4bb3f9fcce8 SHA-1: 527e172d84f2ae0910a4b3c9430c004a1b540d03 SHA-256: 1b637c46f07dc18b0bba8682565efc4915ce35ad1e328533c8358d145657a2bb
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/strik?utm_term=hollywood+movies+in+hindi+dubbed+watch+online+free+2015+filmlinks4u PDF link annotation
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/xujavujitakinegona.pdfIn PDF document text
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/629361.pdfIn PDF document text
    • https://bebamewikirebu.weebly.com/uploads/1/3/0/8/130874540/47d31e18.pdfIn PDF document text
    • https://gedarimetesuja.weebly.com/uploads/1/3/1/3/131398281/mujuzilomidipa.pdfIn PDF document text
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/tuwuxipexatata.pdfIn PDF document text
    • https://lopiranurepo.weebly.com/uploads/1/3/4/7/134735856/zujofivubidud-wugejelexube-denasi.pdfIn PDF document text
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/rubazovezubelibipuvu.pdfIn PDF document text
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/b567c9.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/c747d3e1-cb52-4aaf-9dc0-edb00d912d55/core_java_interview_questions_for_senior_developer_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac794bcf-e0bc-47a7-800c-066b565aff6c/can_you_sleep_with_a_portable_oxygen_concentrator.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/python_convert_dictionary_values_to_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af908a4-982f-432b-a475-aa4c15cec723/vawejulugogitojanezim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2551aa1e-7094-40a5-a983-59bdf5eef61c/63826099855.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/76580286121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7014a71f-14fd-4649-b6eb-cb62f15405a1/rizinezegibodux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/863b0ef7-8462-43b5-b1a7-517abd88dd7e/3550445252.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/789488b4-1abe-41ea-bcbb-d5cc3a281a06/how_to_code_apps_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/kusujap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6820f8e5-ca12-4bfd-8363-4da90b4321d3/jesus_amigo_letra_y_musica.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/ensayo_sobre_el_libro_la_meta.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_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 6216 bytes
SHA-256: 8b04fac990cec7d54a18bf6655f7cb28d7974383c4bcfcc7a7320c6cbbbae7dd
font_01_sfnt_off00010414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 10968 bytes
SHA-256: ead5009b96b76bfbff227fde90c9a2204bf45b0e940642fd446733c693e7665e