Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74229be1ad796e8…

MALICIOUS

PDF

73.9 KB Created: 2021-02-09 23:27:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8202a1325314e9e909d841f8015db2e7 SHA-1: 6f75c15902ec151f74a9c62dd556478045f67790 SHA-256: e74229be1ad796e8312406c44f31f5ee2c7eecbf3de836ed64ea4f8cb87fe1bd
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links pointing to various domains, many of which appear to be part of a link farm designed to manipulate search engine results. The heuristic firings indicate that the PDF is a malicious redirector and part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=caderno%20de%20caligrafia%20pdf%20%20gratis In PDF document text
    • http://titanovyi-filtr.ru/educational_psychology_book_in_urduw915l.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/b3e2d964da295.pdfIn PDF document text
    • http://limons.space/free_powerpoint_presentation_templates_for_biologysgqai.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387054/normal_60033603829b9.pdfIn PDF document text
    • http://topuniversityru.fun/40359323587vrjzi.pdfIn PDF document text
    • http://masito.space/the_dating_playbook_for_men._dow3njrl.pdfIn PDF document text
    • https://watinamubil.weebly.com/uploads/1/3/0/8/130813586/totib_fumixa_savigagobu_pazebuwovagokaf.pdfIn PDF document text
    • https://ninibukakogim.weebly.com/uploads/1/3/2/8/132815385/jutevonapeju.pdfIn PDF document text
    • https://lubikumak.weebly.com/uploads/1/3/1/4/131453733/39a13.pdfIn PDF document text
    • http://yozi.store/sbi_saral_personal_loan_application_formzuukq.pdfIn PDF document text
    • https://kabenodetaxixum.weebly.com/uploads/1/3/4/7/134754863/5358685.pdfIn PDF document text
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/future.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464327/normal_5fe9659075d6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451754/normal_5ff693b68c758.pdfIn PDF document text
    • https://pidowiwosuzaji.weebly.com/uploads/1/3/0/9/130969191/ladokejuwiru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408863/normal_5ff01a6a95637.pdfIn PDF document text
    • http://whitetwo.space/secure_folder_android_1099uuw.pdfIn PDF document text
    • http://netewe5.xyz/gexodazemupaw6ywke.pdfIn PDF document text
    • http://prizinsta24.online/purejo2htf2.pdfIn PDF document text
    • https://watorixaziju.weebly.com/uploads/1/3/4/5/134586039/loleg.pdfIn PDF document text
    • http://hookup157.site/pobisiz08uhn.pdfIn PDF document text
    • https://sajulivos.weebly.com/uploads/1/3/1/1/131164476/791a9aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 5228 bytes
SHA-256: 358a8e022f3b471d2d30c9b90eab4530c178b4e4d10574f077868f5a62146463
font_01_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 12336 bytes
SHA-256: 872f8ccf09e736a104441d880ca1a03b892abb07bfd0d2e36697498c6494fed8