Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44030fcbc2d16f1…

MALICIOUS

PDF

74.5 KB Created: 2021-03-21 11:30:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2adf976d93bf97a5a970ac728f3dc9fb SHA-1: 5b58148028701c614709e3307fa4c2869bfb9e2e SHA-256: b44030fcbc2d16f16b51826240f494ab92ffe5f64a148dbcace8ed38e9744b12
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 0.9989

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/wix?keyword=pdf+cristiano+chaves PDF link annotation
    • https://cdn.sqhk.co/fepogosu/jhcvV0k/tasoxu.pdfIn PDF document text
    • http://tevuvisena.iblogger.org/janenukoxoxavilukomaxiju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476011/normal_605108a069890.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461207/normal_5fef1aa390a5a.pdfIn PDF document text
    • http://riwaxutitono.iblogger.org/bixupulezumofoziwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495395/normal_60127530779f9.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/Jgc5C8g/vozemenezefoneduzabezani.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/5zVhihb/planet_of_the_humans_taken_off_netflix.pdfIn PDF document text
    • https://cdn.sqhk.co/solalokazili/Ejfjgha/76064347127.pdfIn PDF document text
    • https://cdn.sqhk.co/doporaba/WhbjaMo/ding_dong_texas_population_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465543/normal_600827e9730bb.pdfIn PDF document text
    • https://cdn.sqhk.co/nekuripafi/jijaQ3l/dude_perfect_tour_2019_what_do_they_do.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374840/normal_6033dfecc3f94.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/ihrgh6e/fodiboboro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ae40ec61-d20a-40a8-9c94-208d4569f534.filesusr.com/ugd/5d0862_e1a016b8af4a4866adfb6fca4d2d460e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/edfe4bd4-bd99-47f6-875f-f4f8b9a24e90/nj_residential_lease_renewal_agreement.pdfIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_8e9007f174f04866bc259b77bce9d9f5.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_6e74c5cf5c454e89904282c5be498224.pdf?index=trueIn PDF document text
    • http://wotisonuli.epizy.com/housekeeping_department_monthly_report.pdfIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_a23586304b304d9b9e10a483352c1cdb.pdf?index=trueIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_570bdffc4a2441c7a3cb64914ebf3539.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/18855a24-27e3-4625-aea3-faa0f8bcbe74/73138285100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e71726ab-bb56-45b4-a64d-034c4b07d483/arden_shakespeare_sonnets.pdfIn PDF document text
    • http://vimitafukufes.rf.gd/rijezim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80a4ea54-748a-424c-8c90-4ef9c29eabd1/podisalarasawapezul.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 4928 bytes
SHA-256: f9a314da49cd9bce2a076625d8ea0cf41a38bb5295f9574fbc1ef013f7b3ddf2
font_01_sfnt_off0000e8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 12172 bytes
SHA-256: f311ad8bdb10b57d4b243501d11f03acb74a4c6b074c3420b8a790c31d799b62
font_02_sfnt_off00010e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333