Malicious PDF — malware analysis report

Static analysis result for SHA-256 1330559295c62a47…

MALICIOUS

PDF

69.6 KB Created: 2021-05-19 20:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 858eb8d7d2da1415f5b464f52ac85fce SHA-1: 1a56e7925ee3689344fecd9edf6dee2e8800a9bf SHA-256: 1330559295c62a47800689e4cb3ffa91825747c20e35d887b6893ed025bfb5bc
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm designed to manipulate search engine results or distribute further malicious content. The embedded URL 'https://dugedepap.ru/strik?utm_term=libro+de+formaci%25C3%25B3n+c%25C3%25ADvica+y+%25C3%25A9tica+3+de+secundaria+2020' is a primary IOC. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dugedepap.ru/strik?utm_term=libro+de+formaci%25C3%25B3n+c%25C3%25ADvica+y+%25C3%25A9tica+3+de+secundaria+2020 PDF link annotation
    • https://zadumujiz.weebly.com/uploads/1/3/4/6/134626950/3a230b82ae9.pdfIn PDF document text
    • https://likixolokezixi.weebly.com/uploads/1/3/0/7/130738950/a7e02c041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455876/normal_6021cd1ac072c.pdfIn PDF document text
    • https://fusupolupiritox.weebly.com/uploads/1/3/4/3/134374508/0b2bba5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444351/normal_5fcd984dedf11.pdfIn PDF document text
    • https://zagezawuguzuvu.weebly.com/uploads/1/3/4/7/134731207/nixafomazotofibiv.pdfIn PDF document text
    • https://mojulikobamod.weebly.com/uploads/1/3/4/4/134488450/5471458.pdfIn PDF document text
    • https://davijune.weebly.com/uploads/1/3/5/3/135315517/7882003.pdfIn PDF document text
    • https://zuxidonav.weebly.com/uploads/1/3/4/8/134867872/wovedofexo.pdfIn PDF document text
    • https://puwaxitakobesod.weebly.com/uploads/1/3/4/1/134109073/redatofupe_mozamomuba_kotikelebirokin_zuboba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475987/normal_5ff6b9f165d44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454286/normal_602d04b86d7cc.pdfIn PDF document text
    • https://vipekisurular.weebly.com/uploads/1/3/1/4/131453387/bowonuj_lusiwotade_bipaganoruja_lodib.pdfIn PDF document text
    • https://velotukuzikud.weebly.com/uploads/1/3/4/7/134722024/sapofopawivig.pdfIn PDF document text
    • https://bewulikafujisew.weebly.com/uploads/1/3/5/3/135326730/dajojew.pdfIn PDF document text
    • https://bopazexujow.weebly.com/uploads/1/3/4/8/134876268/5044725.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408589/normal_5ff3d1f101e3f.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/dcd45b40-e1e3-4f84-9b52-34faaa8f1e8a/zekesiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6364d70-c145-4583-8cc9-84a68d467ad0/which_oil_heater_is_best_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fff3ae6-af13-4d8d-ba81-cac5a7e27ab2/the_program_book_series.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/ipl_2019_schedule_time_table_pic.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/biometric_fingerprint_reader.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/90877887751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa1b6dcd-cbb0-4dc3-994b-81cfb3adef72/99497770366.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/motiretoxelobidajivafof.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_off0000ce16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE16 6148 bytes
SHA-256: 8187cc53019cd19ee42c3c28c0f5e4e5e6a750ab61c11eac5a62b08a09c9b7f3
font_01_sfnt_off0000e268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE268 10544 bytes
SHA-256: 76eb7eb8577beaa12c998e80c38d9c3fa03aa456622e278f92f5174e3a8202d3