Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0db353857eea77…

MALICIOUS

PDF

77.2 KB Created: 2021-03-11 15:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 83386faf5dcc3c3a7f7133bea9d3b418 SHA-1: c2c9e3914dec8c04759588eefaea5dc9a7873574 SHA-256: de0db353857eea77fa3ce93320bad7c8903b9457f94a4eb03d4ec63edb9d2bf7
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/wix?keyword=dra+2020+jak+wype%25C5%2582ni%25C4%2587 PDF link annotation
    • https://cdn.sqhk.co/tutabudoxuwa/gijebig/55459242632.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/oifichf/true_football_2_mod.pdfIn PDF document text
    • https://viriparerari.weebly.com/uploads/1/3/5/9/135978168/3919261.pdfIn PDF document text
    • https://cdn.sqhk.co/kigowabalo/Dja5MWQ/gotatujuwumulun.pdfIn PDF document text
    • http://zofanelo.22web.org/acordes_de_la_cancion_el_poder_de_la_oracion.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/5641093.pdfIn PDF document text
    • https://polatubogo.weebly.com/uploads/1/3/4/5/134598163/juvigimafejom-tuvirakumemaref.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/2cb76edba54c2d8.pdfIn PDF document text
    • http://lewodazegozi.iblogger.org/12th_computer_science_public_answer_key_2018.pdfIn PDF document text
    • http://jedugefipevama.iblogger.org/how_to_find_my_indesit_oven_model_number.pdfIn PDF document text
    • https://kadefevexenikoz.weebly.com/uploads/1/3/0/8/130813118/donubadixavuviz-xomodaxemenumuv-xubuped.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5405d108-7f1e-482b-a10c-e06f62b7505d.filesusr.com/ugd/d941b1_bf6ea426596b4f2e8dcb8b3767f46272.pdf?index=trueIn PDF document text
    • http://fiwusinuba.rf.gd/87670711347.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/wulinevexaxeropelatalusa.pdfIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_cd5f4489a4b546c897519e673dd20a83.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suximawo/handbell_solo_sheet_music.pdfIn PDF document text
    • http://saxefixuk.epizy.com/78260406932.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/android_open_file_assets_folder.pdfIn PDF document text
    • http://buketoxepebaf.epizy.com/how_to_sign_in_to_class_dojo_as_a_student.pdfIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_9bc87767d263462e9b552a13b08e4254.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/womirofop/pabejajamapewofajupik.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/63492053959.pdfIn PDF document text
    • http://fobupozomorefiw.epizy.com/it_support_engineer_interview_questions.pdfIn PDF document text
    • http://zukisofom.epizy.com/61747293218.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_f8b87559ecb3467b88670cffc0588239.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_off0000eaec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 5404 bytes
SHA-256: 3f171b6aea7f819df3906fd3afcfa8f1eca1df864dbad3f1ba7f3012b77a761f
font_01_sfnt_off0000fd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD85 12868 bytes
SHA-256: 35a9719b2d2de1ec5457af802e4bd5bb8a3c8b4eefa489e8e40660f752f14328

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