Malicious PDF — malware analysis report

Static analysis result for SHA-256 1045a362ceda933a…

MALICIOUS

PDF

69.5 KB Created: 2021-02-18 19:41:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 49edfc375a11a1087135aee50ecfb35c SHA-1: ea1c218081a280e5348fbccb3c913346d56659db SHA-256: 1045a362ceda933a0b4b5a2256477081a2ebd1ab409d7839b7aa7b83ace4deba
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The document body, though heavily obfuscated, suggests a lure related to salary information. The presence of multiple external URLs, including those hosted on Weebly and other dynamic DNS services, indicates an attempt to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jottigo.ru/strik?utm_term=how+much+does+a+operations+specialist+make PDF link annotation
    • https://vafopizinenited.weebly.com/uploads/1/3/4/4/134480139/liwuvuj-kusaposa.pdfIn PDF document text
    • http://xilagima.66ghz.com/lean_process_flow_chart_template.pdfIn PDF document text
    • https://bewepuxajijasi.weebly.com/uploads/1/3/4/3/134362307/3116637.pdfIn PDF document text
    • https://repepojopojak.weebly.com/uploads/1/3/5/9/135970902/ximati.pdfIn PDF document text
    • https://lotefexikig.weebly.com/uploads/1/3/4/0/134097130/wobidijuf-sejixuxenifer.pdfIn PDF document text
    • https://guwuribi.weebly.com/uploads/1/3/0/8/130873976/6212ca334f6d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/tawinuxetoweki.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/aumentando_a_testosterona_de_forma_natural.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/anthropological_theories_upsc.pdfIn PDF document text
    • http://nuxumejaxumem.epizy.com/california_king_fitted_sheet_size_in_cm.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/call_of_duty_1_compressed_file.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/78725270711.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/audio_sound_driver_free.pdfIn PDF document text
    • http://vurasoda.rf.gd/babul_ka_ghar_video_gana.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/lippo_karawaci_tbk_pt_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/write_formal_letter_example_english.pdfIn PDF document text
    • http://jenesigafepi.epizy.com/gutogifuzonegatetis.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_off0000d39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39F 5428 bytes
SHA-256: 20b08dfd6f49463a578bde1a248e59b9e2e2803c06e5bff338cfe64290bd493f
font_01_sfnt_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 10324 bytes
SHA-256: 88494b398efce4abf89860afcec220e700b8c4f17ce12a5eda3a3772089e408b

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