Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece151c58cfe5743…

MALICIOUS

PDF

78.5 KB Created: 2021-03-15 19:36:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 02be3d938c103585621c9406ad063684 SHA-1: d3a09a3e258edd3af0c0ec601b1c5f22b83a6e69 SHA-256: ece151c58cfe5743d6034114f2236dbba7f740b3adaf2ebd5016e82df25a261e
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/strik?utm_term=m2n68-la+narra3+specs PDF link annotation
    • https://cdn.sqhk.co/jorisuzil/Viagjhh/brio_amaze_2017_review.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/iaoipgi/22418635368.pdfIn PDF document text
    • http://kewugujijafe.iblogger.org/mercedes_glc_250_4matic_performance.pdfIn PDF document text
    • http://nimojojisox.22web.org/73465131283.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/Chbhc9L/58301808306.pdfIn PDF document text
    • https://fobabunopana.weebly.com/uploads/1/3/0/9/130969757/4913346.pdfIn PDF document text
    • http://tibujodokerijer.22web.org/92394903299.pdfIn PDF document text
    • https://cdn.sqhk.co/wazuzofi/whcR8gj/40011434852.pdfIn PDF document text
    • https://cdn.sqhk.co/xonudutixova/ifHgigg/fewaxaboverobekinowuki.pdfIn PDF document text
    • https://ropupapufodugut.weebly.com/uploads/1/3/4/6/134650221/vezegexom.pdfIn PDF document text
    • https://watuxiso.weebly.com/uploads/1/3/2/7/132740831/ruwet.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/gFjghdH/mod_morph_minecraft_pe.pdfIn PDF document text
    • https://vawilateg.weebly.com/uploads/1/3/4/6/134697686/dalivukonu-narolul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jolijugidepim.rf.gd/acrobat_reader_9_edit.pdfIn PDF document text
    • http://wumisex.rf.gd/what_is_3_litres_in_pints.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/toxicidad_de_los_aditivos_alimentarios.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/how_do_i_fix_my_treadmill_that_keeps_stopping.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/posafasujotevikerikulake.pdfIn PDF document text
    • http://bibibojusajol.rf.gd/tqm_gestion_de_calidad_total.pdfIn PDF document text
    • http://mibobugaf.rf.gd/47300932280.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/icd_10_code_for_chiari_malformation.pdfIn PDF document text
    • http://xapimiwosusuv.epizy.com/how_do_i_know_what_generation_of_echo_dot_i_have.pdfIn PDF document text
    • http://lamiredej.epizy.com/android_development_action_bar_tutorial.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_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 5608 bytes
SHA-256: 228b7f247a070956b516a04508ba3e2c6eb5a7a55cd24325627a8843e2a43ab5
font_01_sfnt_off000106da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 11180 bytes
SHA-256: b8a0a68ffbae7a56724cbeae258ec69574ea9994e648f8acbd08b195308608f1

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