Malicious PDF — malware analysis report

Static analysis result for SHA-256 0048c3b44ce5ef18…

MALICIOUS

PDF

82.3 KB Created: 2021-02-21 20:17:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 5bb9f47c7d869f87a9d2c063b56fc768 SHA-1: e2c28b130241ad40061e8beab871c98edf22887d SHA-256: 0048c3b44ce5ef187bdfba70484eea3d39a59a666c97add6db5cc96ea421fca3
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL analysis suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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 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/strik?utm_term=how+much+does+a+teeter+hang+up+cost In PDF document text
    • http://usacreditscore.info/5675024541612ft0.pdfIn PDF document text
    • http://kieverts.xyz/hamlet_full_text_downloaducs0h.pdfIn PDF document text
    • http://fixebojamofi.iblogger.org/figurative_language_worksheets_for_grade_6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374976/normal_60263197b8192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388156/normal_601220b143c7f.pdfIn PDF document text
    • http://comp-arenda.site/event_management_proposalzaz0h.pdfIn PDF document text
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/2fcb9439e.pdfIn PDF document text
    • https://fenizivafuno.weebly.com/uploads/1/3/1/3/131380836/sowekeze.pdfIn PDF document text
    • http://registrat.space/appiah_the_lies_that_bindt0k48.pdfIn PDF document text
    • http://giboxibefelas.22web.org/zamivareboganegagutugib.pdfIn PDF document text
    • http://fullcreditreport.info/columbian_exchange_graphx6wpn.pdfIn PDF document text
    • http://tk-pobeda.site/79554058584uu75r.pdfIn PDF document text
    • http://arm-watch3.club/2017_ktm_300_service_manual4kw5v.pdfIn PDF document text
    • http://madewithsunshine.com/79274302381isfes.pdfIn PDF document text
    • http://hookup756.fun/calculating_intake_and_output_worksheet_answersl1741.pdfIn PDF document text
    • http://tameenegypt.com/basic_english_grammar_for_class_2wdxjr.pdfIn PDF document text
    • http://kihepc.xyz/90176610388gqdwr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462362/normal_5fca6b9a93e35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://talakukatutevib.epizy.com/59788882339.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 5508 bytes
SHA-256: c9e24291ee4cce55633579e688ba737559662188558247331ad5372a1434ada4
font_02_sfnt_off000109d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 2868 bytes
SHA-256: 06f18fc0ec2d071b848e4a5e27fe3f2aa8bba634dc8b3064b915d89c9044c72b
font_03_sfnt_off000115c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C3 10960 bytes
SHA-256: a57cafee904ec5cfaaeeca06cf20de13a8330592317bf8b2c23a85a44ffc84c7

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