Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34ebce337f97dec…

MALICIOUS

PDF

96.3 KB Created: 2021-04-08 00:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: bd0dfe2a381284afc84a2287b761d29f SHA-1: 919b6441394e073402f7398729dd4509f918c6c8 SHA-256: d34ebce337f97dec7431d0c533cf1dba5dd08771f3992f5fb42c209e316f7614
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous external URIs, many of which point to disposable hosting. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=sleeping+freshmen+never+lie+chapter+12+summary PDF link annotation
    • http://zuferiwabofeg.22web.org/ncert_chemistry_book_class_12_part_2_solutions.pdfIn PDF document text
    • https://kizujaxaluw.weebly.com/uploads/1/3/4/3/134393650/3025996.pdfIn PDF document text
    • http://wopivobozas.66ghz.com/98679431324.pdfIn PDF document text
    • https://zulevoto.weebly.com/uploads/1/3/2/6/132696122/wosij.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/c75cbabc-dac9-44bf-b9cf-726ed81e7fc3/how_long_will_a_ram_5.7_hemi_last.pdfIn PDF document text
    • http://gixopefujunop.rf.gd/tanelevemogegimow.pdfIn PDF document text
    • http://bigisokuwes.epizy.com/autonomous_cars_technology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84183017-3fb6-469a-a23e-32dfe04c1d80/43057436512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28a20e18-2e4d-4a9c-a88c-d6f8dde54edc/nesowubediru.pdfIn PDF document text
    • http://gimemos.epizy.com/car_lighting_system_components.pdfIn PDF document text
    • http://daxilutoxin.rf.gd/lezoxubodaxore.pdfIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_c83f07d86c7547a3b9ba2874d34734a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe94e967-8a74-464d-88ca-341fdd1f0def/35732839600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/479f4640-8272-4670-abf5-34aa40c7782f/tc_electronic_nd_1_nova_delay_review.pdfIn PDF document text
    • http://luwawabegopit.rf.gd/performance_appraisal_examples_for_administrative_assistants.pdfIn PDF document text
    • http://danijikuguwidak.rf.gd/aaj_tak_weather_report_delhi_today.pdfIn PDF document text
    • http://gewagopixinilu.rf.gd/bnmu_part_1_result_2019_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5710777-5149-4f9f-b696-47eaf1fc5ada/how_to_connect_logitech_k400_to_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e03ef4c-5c94-4be6-9a62-d275f9af0cac/sunufavutonotikoguladune.pdfIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_ce9caa2e4fb545eebb3ea99ee5ac3f7c.pdf?index=trueIn 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_off000139ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AD 5880 bytes
SHA-256: cdd6ab0852b305bd1a80739fc0f8e2ba0949d747feb3333dd47b1d8b9be3563f
font_01_sfnt_off00014da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA3 11260 bytes
SHA-256: 642630f4ab3d105d1897fb9d4bab75688907f434481c304526f7f5074fdbc870