Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3945d6b8636db77…

MALICIOUS

PDF

88.2 KB Created: 2021-03-21 23:14:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 962e27407ce699b70e00aeffc03af245 SHA-1: fc0cb986ab77b5da84acc5d35c5efef1c721da1e SHA-256: e3945d6b8636db772c63175cd74bb77f09351caab917d595453ec3c5021d0744
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=aceix+fact+sheet+pdf PDF link annotation
    • https://cdn.sqhk.co/netimawifes/geM6hji/dekiwapemejejis.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/hiictvx/rolling_sky_download_mac.pdfIn PDF document text
    • http://sijojovimem.22web.org/insiders_report_summer_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/euSJu53/train_station_sim_lite_thomas_and_friends.pdfIn PDF document text
    • https://kilizilefepik.weebly.com/uploads/1/3/0/7/130775254/jupizomonu.pdfIn PDF document text
    • https://vivuguduwidu.weebly.com/uploads/1/3/2/6/132681484/ribosewo.pdfIn PDF document text
    • https://xiridibokolu.weebly.com/uploads/1/3/1/3/131379099/fuzusa-gozan.pdfIn PDF document text
    • https://zonilalafujagep.weebly.com/uploads/1/3/4/7/134731182/fed8697.pdfIn PDF document text
    • https://cdn.sqhk.co/buganisazobu/e2Cgfmn/darajo.pdfIn PDF document text
    • https://vematonejos.weebly.com/uploads/1/3/1/3/131383464/e951a9ce6d4c1a.pdfIn PDF document text
    • https://cdn.sqhk.co/boxewemutox/bhgygdW/puninapemepesulibutoti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wamijak.epizy.com/60646555947.pdfIn PDF document text
    • http://sawezigulafufa.epizy.com/dudenojuf.pdfIn PDF document text
    • http://kinapemib.rf.gd/9493117164.pdfIn PDF document text
    • http://novosumagib.epizy.com/473615381.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/20737016627.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/86813493798.pdfIn PDF document text
    • http://netuvorib.epizy.com/64240270458.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/33706831547.pdfIn PDF document text
    • http://pitovevewapa.epizy.com/berhampur_university_syllabus_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/powered_wheelchair_assessment_form.pdfIn PDF document text
    • https://www.cancer.gov/coronavirusIn 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_off00011cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 5172 bytes
SHA-256: 3788684765a184fc8cf539565c46002832ed19bb182a5ae152848fb86e2b54ff
font_01_sfnt_off00012e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E52 11100 bytes
SHA-256: 495a738494502c686407a90779ed2bfe0d0ab7a401c107bad0f5981dc21d8e25

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